Currently Being ModeratedMar 8, 2012 5:57 PM (in response to hoiilfromseattle)
remove a few things to another external drive or flash drive - enough to load a couple of apps which are definate space-savers. I use an SD card since I've got a 13"...works great for storing stuff off of the mac where needed.
Find monolingual. This removes any/all of the built-in languages which come with the OS and applications. I ran it on mine (just had rebuilt it), saved over a Gig of space in just doing that alone. Once you've run it you can uninstall it to save even more space. It's free.
There's also another app called xslimmer. it goes through your apps (you tell it what to run against), and removes files which weren't meant for your specific system - again, saves a lot of space.