I have been using Dolphin for a while and I really like all of it's features. Yeah it has it's "issues" but what piece of software doesn't. I haven't checked out Dolphin HD yet but I will have to give it a look. Thanks for the review.

I have found on my Motorola Droid that killing apps has no real advantages as far as battery life goes but as others have mentioned it will speed things up if you kill tasks that aren't being used. I have found that as one would expect the fewer tasks one has running the faster and more stable you phone becomes.