I know how to browse my project's subversion repository through its web front-end, but it seems that I can only browse the latest revision of the trunk. Is there a way to browse an older revision of the trunk through the web-ui?
I know how to do this from the command-line, but I need to know how to do this using URL's, because I'm embedding these URL's into a document. I also know I could create an svn-style tag of the trunk, but I would prefer not to do that.
The built-in web interface does not allow retrieving of old revisions (or any other info than what you've already seen). You can install third-party web-based repository browsing software to get around this limitation. I haven't used any myself, so I'm not going to offer recommendations, but I'm sure others will (a quick google search will help you find some too).
Append something like this to your repository URL:
!svn/bc/<revision_number>/
E.g.
http://www.example.com/svnrepository/!svn/bc/3/
It depends on the svn webclient you're using. In the case of trac (and maybe some others), just add the the parameter rev= to the querystring.
i.e. http://trac.example.com/log/trunk/client/filename?rev=123