My menu bar has been featured at the blog of the great folks of Mac Menu Bars.
I highly recommend to check out their blog. You gonna find some nuggets there.
Scroll Reverser: Inversed scrolling like in Lion.
Keyboard Maestro: Automation Maestro. One of my favorite tools. I use it for such a lot of stuff.
Dropbox: No explanation required.
iStat Menus: System status in menubar. (Network, memory, CPU, day and 24h clock)
Watts: Calibration monitor.
(From Andreas, of Mac OS X Screencasts and MOSX.Tumblr.com)