I'm grumpy this weekend, so I'm going to post a pet peeve.
Something that I'm seeing increasingly often online that bugs the hell out of me is windows that don't move.
Got to local.live.com and click on the about button. Looks like a window, right? In FireFox, I tried to move it, and ended up selecting a bunch of text. Grrr. Arrgh.
This is basic UI stuff. It has to be, as I'm not a UI guy, but I've heard this so many times :-) If your new thingimijig doesn't work like a <common thing X>, then please don't make it look like a <common thing X>. Find another common thing Y that should be expected to work like your thingimijig.
I realise I've offered a problem rather than a solution here, so I'll offer a better way for this example. I can understand the intent to keep the user immersed in the gorgeous web app. I suggest that they just get rid of the top bar on that window (making it no longer look like a window), keeping the close button where it is. This also gets rid of one of the two identical "About" titles that are back to back.