You can also view replies, direct messages and post updates. Before you use Google Gadget, make sure you have enable custom gadgets in Gmail where you can find it under Labs page under Setting.
After that, you just insert the URL via the news “Gadgets” link you’ll have under Settings – http://www.twittergadget.com/gadget_gmail.xml – then enter your Twitter ID and Password.
Since I will open my Gmail first when I’m online, I can post and reply my twitter message at the same time. Save my time and click. Because I have many thing to click and drop when I’m online ;).
TwitterGadget is completely AJAX based, meaning, at the user-specified refresh interval, only the status update content is refreshed in-line, on the gadget page. This means reduced bandwidth utilization between you and Twitter.com, while providing for a more user-friendly experience.