Showing example code on the home page is a great idea, having the small thumbnail with the expand icon made it easy to jump in and see what their API looks like. Going to give this library a try soon :)
Xcode4, Quicksilver, BBedit, Terminal, Finder, Versions (svn) or MacHg (hg)
Then...
iCal, Adium, Chrome, Dropbox
I don't use Launchpad, though I can't honestly say I've given it a fair chance. I can't live without Quicksilver, this may have something to do with it.
I do my work on my main display (27"), and have Adium/Mail/Chrome on my smaller second display, to keep a nice separation between work and meta-work
Things I always do on a new Mac for development:
1) Reduce the key repeat delay, increase the key repeat speed (way too slow in Terminal by default, imo)
2) Dock hiding automatically
3) Install all apps listed above
4) Give the machine a clever host name