The K-Desktop Environment. Fast and snappy, works well, looks good. I use it. Many many utilities. Easy to install in Fedora, just use yum group-install KDE
dimdim is a free and open-source web conferencing product similar to webex. It allows for presentations to be done over the web and is very useful for discussions and demonstrations. I have installed the alpha and beta versions of the server and used the alpha version quite a few times and it has worked very well (the beta version has some stability issues).
Unfortunately an incompatibility had crept in when using the presenter from within a VMware image when that image was running on a host using compiz. Not a terribly common setup perhaps, although visually very appealing. An easy fix to the problem is to revert the VMware image video driver back to the non-vmware version installed along with the vmware-tools.