im a web dev, which means my demands might be a little atypical 
Generally:
Firefox when developing
Safari + SafariStand generally - it's much faster
Quicksilver to launch searches and pull up bookmarks in either
Opera 9 on windows
also, give Camino a shot. It's a Mac-specific version of Firefox.
http://www.caminobrowser.org/
They just made new release with some much-desired features.
You can also find some special performance-oriented Mac builds of Camino and Firefox from time to time. This helps offset some of the pain of Firefox's speed problem. I've been told the FasterFox plugin does wonders for some. I haven't tried it on Mac.
Also, i find certain plugins (flash, divx, etc) tend to cause more Firefox crashes than safari crashes.
Generally:
Firefox when developing
Safari + SafariStand generally - it's much faster
Quicksilver to launch searches and pull up bookmarks in either
Opera 9 on windows
also, give Camino a shot. It's a Mac-specific version of Firefox.
http://www.caminobrowser.org/
They just made new release with some much-desired features.
You can also find some special performance-oriented Mac builds of Camino and Firefox from time to time. This helps offset some of the pain of Firefox's speed problem. I've been told the FasterFox plugin does wonders for some. I haven't tried it on Mac.
Also, i find certain plugins (flash, divx, etc) tend to cause more Firefox crashes than safari crashes.