These are Wordpress 2.3 compatible plugins from letter U to Z, these plugins can be downloaded from the sites specified below :

U – Z

1. Upcoming Events (http://jacob.steenhagen.us/blog/upcoming-events) 0.4
2. Upgrade Preflight Check (http://smithsrus.com/downloads/wordpress-upgrade-preflight-check/) 1.0
3. Upload+ (http://wordpress.org/extend/plugins/uploadplus/) 0.3.3
4. User Bio Popup (http://www.dagondesign.com/articles/user-bio-popup-plugin-for-wordpress/) 2.4
5. User Permissions (http://urbangiraffe.com/plugins/user-permissions/) 0.6
6. Verse-O-Matic (http://butlerblog.com/verse-o-matic/) 3.3.0
7. VideoPop (http://www.lynk.de/wordpress/videopop/) 1.3.1
8. Viper’s Video Quicktags (http://www.viper007bond.com/wordpress-plugins/vipers-video-quicktags/) 5.1.4
9. Visitor Counter Widget (http://www.tamagothi.de/2007/08/27/wordpress-widget-besucherzaehler/) 1.0
10. videos Playing In Place (http://wiki.vpip.org/index.php?title=Wordpress_Install) 0.12e
11. VR-Frases (http://www.vruiz.net/2007/09/18/vr-frases/) 1.3
12. VR-Visitas (http://www.vruiz.net/2006/08/29/vr-visitas/) 2.0
13. WassUp (http://www.michelem.org/wordpress-plugin-wassup-real-time-visitors-tracking/) 1.1.3b
14. WeatherIcon (http://www.viper007bond.com/wordpress-plugins/weathericon/) 2.99.123
15. Welcome Visitor (http://guff.szub.net/2006/04/12/welcome-visitor/) R1
16. What Would Seth Godin Do (http://www.richardkmiller.com/blog/wordpress-plugin-what-would-seth-godin-do) 1.3
17. Who Link Here – Incoming Links (http://www.artux.com.ar/contenido/nueva-version-del-plugin-who-link-here-para-mostrar-los-enlaces-entrantes/) (2.0)
18. WordBook (http://www.tsaiberspace.net/blog/2007/07/29/wordbook/) 0.10.4
19. WordPress.com Admin Bar (http://www.viper007bond.com/wordpress-plugins/wordpresscom-admin-bar/) 1.0.3
20. WordPress.com Stats (http://wordpress.org/extend/plugins/stats/) 1.1.1
21. WordPress Database Backup (http://www.ilfilosofo.com/blog/wp-db-backup) 2.1.3
22. WordPress Video Plugin (http://www.daburna.de/blog/2006/12/13/wordpress-video-plugin/) 0.62
23. wordTube by Alex Rabe (http://alexrabe.boelinger.com/?page_id=20/) 1.52
24. WP 2.3 Related Posts (http://wordpress.org/extend/plugins/wordpress-23-related-posts-plugin/) 0.2
25. WP AJAX Edit Comments (http://www.raproject.com/wordpress/wp-ajax-edit-comments/) 1.1.1.2
26. WP-Amazon (http://manalang.com/wp-amazon/) 2.0 beta 1.1
27. WP-AVIM (http://onetruebrace.com/wp-avim) 1.0
28. WP-Ban (http://www.lesterchan.net/portfolio/programming.php) 1.20
29. WP-Cache (http://mnm.uib.es/gallir/wp-cache-2/) 2.1+
30. WP-Chiclets (http://www.tsaiberspace.net/blog/2007/07/20/wp-chiclets/) 1.2.3
31. WP-Comment Quicktags Plus (http://blog.lmbbox.com/lmbbox-plugins/lmbbox-comment-quicktags/wp-comment-quicktags-plus/) 1.3
32. WP Contact Form: Askimet Edition (http://www.bloggingexpertise.com/plugins/wp-contactform-akismet/) 1.1
33. WP-DBManager (http://www.lesterchan.net/portfolio/programming.php) 2.20
34. WP-DownloadManager (http://wordpress.org/extend/plugins/wp-downloadmanager/) 1.00
35. WP-dTree (http://wordpress.org/extend/plugins/wp-dtree-30/) 3.3
36. WP-Email (http://www.lesterchan.net/portfolio/programming.php) 2.20
37. WP-FileManager (http://johannesries.de/webwork/wp-filemanager/) 1.2
38. WP-Footnotes (http://wordpress.org/extend/plugins/wp-footnotes/installation/) 2.2
39. WP-Forum (http://www.fahlstad.se/wp-plugins/wp-forum) 1.7.4
40. WP-Forum Latest Posts (http://www.schloebe.de/wordpress/wp-forum-latest-posts-plugin/) 0.5
41. WPG2 (http://wordpress.org/extend/plugins/wpg2/) 3.0.1
42. WP-Members (http://butlerblog.com/wp-members/) 2.0.1
43. WP Movie Ratings (http://paulgoscicki.com/projects/wp-movie-ratings/) 1.4
44. WP-PageNavi (http://www.lesterchan.net/portfolio/programming.php) 2.20
45. WP-phpMyAdmin (http://wordpress.designpraxis.at/plugins/wp-phpmyadmin/) 2.10.3
46. WP-Polls (http://www.lesterchan.net/portfolio/programming.php) 2.21
47. WP Plugins Tracker (http://www.wp-plugins-db.org/wp-plugins-tracker) 0.2
48. WP-PluginsUsed (http://wordpress.org/extend/plugins/wp-pluginsused/) 1.00
49. WP-PostRatings (http://www.lesterchan.net/portfolio/programming.php) 1.20
50. WP-PostViews (http://www.lesterchan.net/portfolio/programming.php) 1.20
51. WP-Print (http://www.lesterchan.net/portfolio/programming.php) 2.20
52. WP-Quotes (Random Quotes) (http://www.zombierobot.com/wp-quotes/) 1.3
53. WP-RelativeDate (http://www.lesterchan.net/portfolio/programming.php) 1.20
54. WP-ServerInfo (http://www.lesterchan.net/portfolio/programming.php) 1.00
55. WP-SimpleViewer (http://wp-simpleviewer.fuggi82.de/) 1.00
56. WP-SNAP! (http://www.nateomedia.com/wares/downloads/wordpress/wp-snap/) 0.7.3
57. WP-Stats (http://www.lesterchan.net/portfolio/programming.php) 2.20
58. WP-Sticky (http://www.lesterchan.net/portfolio/programming.php) 1.10
59. WP Super Edit (http://www.funroe.net/projects/superedit/) 1.1
60. WP-Syntax (http://wordpress.org/extend/plugins/wp-syntax/) 0.6
61. WP User Moderation (http://www.dealsway.net/2007/09/04/wp-user-moderation/) 0.4
62. WP-UserOnline (http://www.lesterchan.net/portfolio/programming.php) 2.20
63. WP-WAP (http://www.lesterchan.net/portfolio/programming.php) 2.10
64. WPtags 4 MetaKeywords (http://www.weinschenker.name/wptags-4-metakeywords/) 0.6
65. Yet Another Advanced Paged Navigation (http://dreamincolours.com/projects/wordpress-plugins/yaapn/) 1.05
66. Yet Another PhotoBlog (http://johannes.jarolim.com/yapb) beta 1.6

Ok, this is the last of the post with the Wordpress 2.3 compatible Plugins, you’ll find the other plugins in the “Wordpress Plugins” Category.