Super minor, but... The little text area at the bottom of the chat has a resize handle in the latest FF and probably chrome.
http://www.google.com/support/forum/p/Chrome/thread?tid=5f9cd62207e2c7a8&hl=en
http://www.google.com/support/forum/p/Chrome/thread?tid=5f9cd62207e2c7a8&hl=en