Your design is lacking in a few points.

For one, you can't tell what the page is about. It looks like a repository for AIM avatars used by Middle Schoolers. (I say this because my little sister uses AIM all the time and half the avatars from thre are used on her friends accounts.)

You need to give people a sense of direction. I went on your page and had no idea what to do. A little register button way out of my view doesn't help me.

Also, when I inspected your table-infested layout in IE6, it, as expected, broke.

And for my final harsh critique: Your logo doesn't have a link to the main page.

Aside from that, your security is good, and the design looks great. You didn't forget a Favicon, which is awesome.

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Signatures are nothing but incriminating.