Yep...looks nice and clean...except the damn Google ads! Maybe try a white background or match your blue behind them...and just select a different font. Not that I'm a graphics artist or anything
I would reduce your archive size. I seriously doubt anyone will go back looking for your content more than a month or two. They will use the search function or categories before they do. Also, it's robbing your SEO value from your important keywords, like Opera. Example, Opera might show up on your site right now 2% of the time. Without them it could show up 2.25%of the time making it more valuable. Here is how you reduce the archive, just go to your sidebar, look for the call to the archive and adjust it to this: <?php wp_get_archives('type=monthly&limit=2'); ?> The 2 is the number of months you want to go back. Set this to what you think. I actually ran tests on my site, and it was very rare that people actually hit month 3.
Massive side scrollbar... Found why too. Might only be in Opera (havn't checked), but as your blog is for Opera users...you should probably fix it.