The caboo.se blog has kept a lot of activity happening, staffed with a pile of Railsers who’ve been around for awhile.

• adding no-follow to comment links—I don’t like this kind of comment neutralization, but it’s a good example of how to weed out regexps and who am I to talk, I’m constantly knee-deep in spam around here.
• sending inline e-mail attachments—ActionMailer docs just aren’t up to snuff. I’ve covered how to receive mail.
• using darcs and rails and also a follow-up with darcs and switchtower.