Actually, it looks like the forums already do this when mousing over the username. I'd like this existing functionality added to opponent names in Live Chess.
Mouseover tiny icon -> display fullsize avatar
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A quick enhancement I'd like. Avatars can be up to 100x100 but in Live Chess, they show only a tiny version. Some sites popup a full-size version of a resized avatar on mouseover. Here's an example, using only words and gravatars (not thumbnails):
http://planetozh.com/blog/my-projects/wordpress-plugin-avatar-gravatar-popup/
Surely this can be modified to work on chess.com. Basically, when you mouse over the displayed userpic, a full-size version pops up.