Mac OS X people, if you've been using Firefox for your web browsing but find it to be slow, or if you've been using Safari but wish it would work with more pages or had a slightly larger feature set, you might want to take a look at Camino. Like Safari, it's a native OS X browser, but it includes some of the features of Firefox. Specifically, it uses the Mozilla engine, so sites that won't work in Safari will work fine in it. The only thing it's missing that I really like in Firefox is the ability to run extensions like DeepestSender, but I hardly ever used that anyway.
The benefits of being an OS X native application: Mainly, it's much faster. Not the web loading, necessarily, but things like loading the window and opening new tabs and whatnot are much less delayed. Of course, it also uses somewhat fewer system resources, at least processor power, though I haven't done a memory use comparison. Aspects of OS X like drag and drop work more like you expect. Finally (and this is the killer for me), you can use the things in the Services menu with web text, which is cool if you have a bunch of services installed like I do.
Check it out if you're the type of person that enjoys playing with new software. For the moment, at least, it's become my default web browser.