Hey, its not bad... even though those site-entrance popups do get on my nerves somewhat. Anyway, here's some constructive criticism:
- Consider a more detailed background. I like the colour, but a very slight hint of texture in there could really spruce it up!
- Increase the left and right margins for your main text area. At the moment the gradient at the edges interferes slightly with your content (or at least it does on my browser).
- Some of your wallpapers are nice, but they are all FAR too small. Try outputting at least 1280x1024px images... or 1600x1200 if you can manage it. Us designers are pretty demanding of high resolutions.
Anyway, keep up the good work! Oh, and welcome to Biorust! I hope you enjoy your stay...