Just upgraded to WordPress 2.5 using subversion, took me a total of 5 minutes to do (excellent). Disabled all the plugins, ran the following command and updated the database. If your going to try it yourself I would suggest that you read the documentation provided by the WordPress Team before you try. You do of course, need shell access to your webpages before you can use Subversion.
svn sw http://svn.automattic.com/wordpress/tags/2.5/
Part of the output below.
<-snip->
U wp-admin/link-add.php
U wp-admin/edit.php
U wp-admin/upgrade.php
U wp-admin/index-extra.php
U wp-admin/options.php
U wp-admin/link.php
U wp-admin/profile.php
U wp-admin/edit-category-form.php
U wp-admin/user-edit.php
U wp-admin/options-reading.php
D wp-admin/css/upload.css
A wp-admin/css/ie-rtl.css
A wp-admin/css/ie.css
A wp-admin/css/global.css
U wp-admin/css/install-rtl.css
A wp-admin/css/colors-fresh-rtl.css
UU wp-admin/css/widgets-rtl.css
U wp-admin/css/install.css
A wp-admin/css/colors-fresh.css
U wp-admin/css/widgets.css
A wp-admin/css/login-rtl.css
A wp-admin/css/login.css
A wp-admin/css/media-rtl.css
A wp-admin/css/media.css
A wp-admin/css/colors-classic-rtl.css
A wp-admin/css/colors-classic.css
A wp-admin/css/theme-editor-rtl.css
A wp-admin/css/dashboard-rtl.css
A wp-admin/css/theme-editor.css
A wp-admin/css/dashboard.css
U wp-admin/page-new.php
U wp-admin/setup-config.php
U wp-admin/link-manager.php
U wp-admin/install.php
U wp-admin/widgets.php
U wp-admin/sidebar.php
U wp-admin/bookmarklet.php
U wp-admin/import.php
U wp-admin/options-permalink.php
U wp-admin/page.php
U wp-admin/options-writing.php
U wp-admin/export.php
U wp-admin/plugin-editor.php
U wp-admin/edit-pages.php
U wp-admin/admin-footer.php
U wp-admin/categories.php
U wp-admin/themes.php
Updated to revision 7569.
U wp-admin/link-add.php
U wp-admin/edit.php
U wp-admin/upgrade.php
U wp-admin/index-extra.php
U wp-admin/options.php
U wp-admin/link.php
U wp-admin/profile.php
U wp-admin/edit-category-form.php
U wp-admin/user-edit.php
U wp-admin/options-reading.php
D wp-admin/css/upload.css
A wp-admin/css/ie-rtl.css
A wp-admin/css/ie.css
A wp-admin/css/global.css
U wp-admin/css/install-rtl.css
A wp-admin/css/colors-fresh-rtl.css
UU wp-admin/css/widgets-rtl.css
U wp-admin/css/install.css
A wp-admin/css/colors-fresh.css
U wp-admin/css/widgets.css
A wp-admin/css/login-rtl.css
A wp-admin/css/login.css
A wp-admin/css/media-rtl.css
A wp-admin/css/media.css
A wp-admin/css/colors-classic-rtl.css
A wp-admin/css/colors-classic.css
A wp-admin/css/theme-editor-rtl.css
A wp-admin/css/dashboard-rtl.css
A wp-admin/css/theme-editor.css
A wp-admin/css/dashboard.css
U wp-admin/page-new.php
U wp-admin/setup-config.php
U wp-admin/link-manager.php
U wp-admin/install.php
U wp-admin/widgets.php
U wp-admin/sidebar.php
U wp-admin/bookmarklet.php
U wp-admin/import.php
U wp-admin/options-permalink.php
U wp-admin/page.php
U wp-admin/options-writing.php
U wp-admin/export.php
U wp-admin/plugin-editor.php
U wp-admin/edit-pages.php
U wp-admin/admin-footer.php
U wp-admin/categories.php
U wp-admin/themes.php
Updated to revision 7569.
Enabled all my plugins one at a time and tested, job done in about 15 minutes.
