Google enabled IMAP support for Gmail and Google Apps and started rolling it out last week. This is great news as it makes managing email across devices dead simple. I setup Thunderbird on my laptop, and I am super pumped to now have a great desktop client to use. I love Google's web interface for Gmail, but it's nice to have a dedicated desktop app as well.
Here's a great article on configuring Thunderbird to use IMAP for Gmail/Google Apps for those that would like to/