Speaking of Gmail: I wish Google will unify the Gmail and Blogger message/post composers. They are almost identical, but each of them has its advantages:
Gmail: looks better. The "font" and "size" selectors are smaller (better). Better speller.
Blogger: Allows images to be inserted to the post. Allows HTML source editing.
In Gmail, you can only insert an image that is already hosted somewhere on the web (like it used to be with Blogger). You add an image by dragging it from a webpage to your message. You cannot however embed an image that is attached to the message.