http://www.geoshell.com/index.asp
A really great revision highly customisable, low resource usage, speedy response and if you use it in conjunction with an explorer shell replacement (I recommend Directory Opus, although some people love Total Commander), you won't ever see explorer.exe again
The new version they've been working on the tray mostly, so you get much more functionality there (hide icons works a lot better than it does in explorer, and it rescues them on a crash [so I read, I wouldn't know because its yet to crash, probably because I killed off explorer altogether
])
Some stuff that isn't covered in the documentation, or is, but given that no real man in existance would ever read a manual, here's some stuff I figured out.
To add a new plugin to a geobar, you click second button right on the left side, and you go to load plugin. To configure the plugin itself, hold down CTRL and right click. Right clicking normal just comes up with options, but holding control lets you select what exactly you want the plugin to do. You'll also need to do a little bit of registry editing, since it reads all its settings from there.
So here's a some tips on that note:
HKEY_CURRENT_USER\Software\geo\GeoShell\Services\Plugins
On each geobar, set the snapto to -3 if they don't quite snap to the side of your screen
HKEY_CURRENT_USER\Software\geo\GeoShell\ShellUI\Desktop
You can adjust the monitor viewing size here, so you can make sure if you want to make a start menu type bar, you can adjust the maximise to only fill the viewable part of the screen. You can do this for each monitor if you run many. ~-25 is the size of a bar.
There's a few skins lying around too
