I have a new MB and am noticing that browsing the web with Safari seems very slow at times vs. using it on other Macs. Is this just in my head or is there some issue with it?
What websites are you talking about? Its possible some heavy flash games (such as AddictingGames.com) could be a little slower, but any "common" website (ESPN, News, Google, etc) should perform just fine. No reason they should be any slower.
How 'new' is 'new'? It took quite a while for my new machine to reach 'normal' performance, particularly because I was on crappy hotel wi-fi, which seemed to cause some things to fail to sync up properly on the first attempt.
Check in 'Activity Monitor' if anything is using loads of CPU or Network resources. I found one of the calendar sync processes was chewing loads of CPU until I removed and readded my calendars.