People have been dying to start writing extensions for Chrome since it was first released. I’ve actually become accustomed to living without extensions when using Chrome, because the speed and other interface tweaks fit my workflow very well. Still the ability to add extensions to Chrome is a huge step forward.
Currently, you need to use the developer version of Chrome ( instructions here ) to install extensions and the installation/management process is still pretty basic, but it’s a good start.
Now, Google just needs to get versions out for Mac and Linux.