That's curious. I would've imagined adding N generic website slots would be easier than adding N specific-website slots with icons. I haven't administrated Simple Machines though, so I wouldn't know. Hopefully a modification for it will come along.

Even though I use AIM more regularly than any other communication platform, I still agree that the list of IM options is outdated to the point of uselessness.

It would be nice to have something more like a textbox where you can enter your stuff line-by-line, Network: Username, and to have the relevant links built based on what "Network" is, with unrecognized ones just left as plaintext. That way the forum could have support for more networks added (or old ones removed) over time without losing contact info. I doubt there's a premade plugin for that, though - plugin-makers seem obsessed with having dedicated fields for everything.

I'm liking this new skin a lot, but I hate how blurry the post text is (which I see has already been mentioned). The colours are fine, the problem is just the font - it doesn't include a bitmap version (or is too new; I've heard Windows ignores embedded bitmaps for all but a few legacy fonts) and is not hinted well enough for it to render cleanly at this size.

Playing around in Firebug, I disabled the Titillium Web font and kept just the "Verdana, Arial, Helvetica, sans-serif" part of the CSS and the forum looks lovely and clear (I'd probably change the size to be a little smaller though).

Edit: It took me too long to see that to get to the other account settings you have to mouse-over the "Modify Profile" bit. Maybe put a little down arrow icon next to things that open menus on mouse-over? I've set it to use sidebars (I'm so glad that's an option!) because I just know that I'll forget again.

The tile-blending explains the... odd appearance, then! Why not make transition tiles? Using cross-fading doesn't help you eliminate the blocky, obvious boundaries between different terrain tiles, so it's about as good as just putting tiles right next to each other with no blending, the only benefit is it's not quite as harsh. I think if your goal is to avoid a harsh blocky look, you should put in the time to make transition tiles that help break up the blockiness. If you're smart about it, you can make tiles that can serve as transitions between several different terrain types instead of making transitions for every terrain pair. Another alternative is to use two layers for the background: a base layer, and a transition layer made up of overlap tiles that create transitions by overlapping the tiles beneath them (with no blending effects, just strict transparency). Then you can have your vertical elements on top of that.

Your various vertical elements also appear to cast shadows in two different directions.