After searching for a while for a list of standard urls to reserve for your own use on the webapp you’re building, I decided to compile my own.. Starting with what twitter seem to reserve (they don’t publish a list, understandably), and adding a few of my own. If you can think of others, put them in the comments and I’ll update as appropriate.
Other things to consider are.. Reserve anything with the name of your app included (e.g. twitter don’t allow users to create urls that include “twitter”). Reserve as many urls for authentication methods as possible, I only included a couple here, oauth and openid.
Here’s a published google doc, and a csv file, text, and xls.

Comment by Paul Silver
October 15, 2009 @ 3:03 pm
I’d also go for /feeds (for flexibility), /config
I’m not sure if I’d put forgotten password functionality under /forgotten or not, probably it’d go in /login/forgotten so you’ve covered that.
Depending if people want/need to offer short URLs for redirection, they might want to reserve a single letter like /r/
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October 15, 2009 @ 3:55 pm
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Comment by James Ogilvie
October 15, 2009 @ 5:18 pm
/auth
/ftp
/api
/md5
/ssh
/ssl
/administrator
/signin
/logs
Comment by James Ogilvie
October 15, 2009 @ 5:20 pm
/404 ;o)
Comment by Remy Sharp
October 16, 2009 @ 1:41 pm
For reference, twitter also have http://twitter.com/widgets pointing to a “real” page.
Comment by Josh Russell
October 16, 2009 @ 1:44 pm
thanks guys, i’ll update the file and post today :)