I'd like to add a couple of things that impress me about DreamHost:
1. They tell it like it is. Industry insiders may not like them telling the truth about overselling, but they do and I appreciate it. If they screw up with an upgrade, they'll admit to it and do their best to correct the situation as soon as possible. Everyone has problems, not everyone will admit to them. I've noticed that even airlines have started telling the truth more often about when your flight is going to leave "We'll get an update from air traffic control in an hour. That doesn't mean that we'll take off in an hour, just that we won't leave before the hour is up."
2. Other sites may offer more (or fewer) one-click installs, but DreamHost offers MediaWiki, which was compelling to me. They also offer a nice wiki themselves with some great technical information on installing software on your dreamhosted site. Plus they've actually done a good job of picking the best of class for many of the products!
Plus how can you go wrong with the fantastic promo code offers you can find here on the forums?
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