I'm a big fan of Opera, been using it since 2003 now. Chrome looks quite nice but I don't notice it being much faster than Opera, which just has everything I need built in.
Not so much on the ads, but Google Analytics- we did a report on the web proxy recently to find that google-analytics.com was the number 17 top traffic site so far that month, pushing through I think 1.1GB of traffic just in 18 days or so. Luckily, we're on KAREN (NZ high speed research and education network) and peered to Internet2 so Google traffic is free for us. Otherwise we would have been paying quite a reasonable amount for international traffic just for Google Analytics. Gives you something to think about!