[pretz]

It's worth noting that if you're always searching in a git repo, git-grep is pretty comparable to ack and you already have it installed.

[badman_ting]

Totally, I use it all the time now. Here's a pretty great writeup on git grep that was on HN recently: http://travisjeffery.com/b/2012/02/search-a-git-repo-like-a-...