I've installed all the major browsers on my AAO but I have a hard time picking a favorite. Internet Explorer: 7 is slow and lacks features. 8 is also slow but has more features. Also it still uses too much screen real estate for all the toolbars etc. Maybe if you have a 3 GHz Quad, 6GB RAM and a 30" screen. Firefox 3: Tried and true, and what I use on my desktop machine. There are a few "hickups" when filling out forms or entering URLs on the SSD-equiped AAO. Youtube videos stutter a little if you're playing back while it's still downloading, not due to bandwidth issues, but because of the writes to the SSD. You can customize the browser in almost any way - I only use tiny navigation buttons, and auto-hide the status and menu bars. Chrome: Seems pretty fast but not enough features. Images don't get enlarged when you zoom, messing up the page layout. No autoscroll by clicking the middle mouse button or wheel. Safari 4: Surprisingly fast - didn't expect this since iTunes is a useless, memory hogging piece of crap bordering on malware. UI-wise, Safari doesn't integrate too well with Windows but at least it uses proper Windows titlebars for windows now. However the window titlebars are super-thick for some reason. Youtube videos barely skip frames while streaming. Complex pages load quickly. Minimalist navigation buttons and menus. I kind of like this, to my surprise. However it's freaking ugly. Opera: Uses the least memory. Very fast. Uses a lot of screen real estate by default but can easily be customized. Slower than Safari for Youtube but faster than Firefox or IE. No hickups due to the SSD except for Youtube. The big drawback for me is that you can't have small windows "floating" outside of the main application. Some community sites and webmail services use a small floating window to notify of new messages etc so you don't need to leave a big page open, but with Opera, this window has to "live" inside a big Opera window. I like Firefox the best, but both Safari and Opera are faster due to the SSD issues. Opera would be perfect because it's so fast and uses so little RAM, but I can't use it due to the floating windows issue. I guess that makes Safari the best choice...but it's so ugly... I don't want to keep switching browsers either, I need to decide on one. What do you use on your AAO and why?