I'm so excited! Finally, Better Gmail 2 support HTML Signatures. there's a couple steps to it, but once it's setup, it's beautiful, and gets seamlessly inserted in new messages. I can now send email from web-based gmail, as well as outlook/Mac Mail, and have my outgoing mail look the same! Yippeee!!
Also, as a side note, if you download this version of Better Gmail 2 (0.5.1) , check out the redesigned skin, it's on a black background, and it looks amazing!