[dismas]

No music unless absolutely necessary (e.g. if it's a music site but even then, do NOT have it auto-play)

No "click to enter" splash page crap. I'm there at your site, of course I want to see what you offer, so why not put it on the front page? Don't annoy me by asking me to deal with some splash page that tells me nothing.

Keep flash to a minimum unless you're hosting games or whatever. Depending on which system I'm browsing from here at work, I may not be able to see the flash elements and I'm sure I'm not the only one with employers who don't allow flash to play.

Don't open new windows/tabs if I'm not leaving your site. This is one of the things that I hate about GoDaddy. By the time you get even the smallest thing done on the site, you've opened five new windows/tabs. I want to control how many tabs I have open, I don't want to be told how many I'll have.