All sorts of gadgets are being released for use with GMail labs. This one looks good if you make use of Twitter.
Access Twitter Through Gmail With TwitterGadget
To access it, you’ll first need to enable custom gadgets in Gmail, which can be done from the Labs page under Settings. From there, you just insert the URL via the news “Gadgets” link you’ll have under Settings – http://www.twittergadget.com/gadget_gmail.xml – at which point you’ll be prompted for your Twitter login.
