Firefox 2.0 was released this morning, less than an hour ago. It has a lot of new features , some of which include spell-check while typing anything in a textfield in a web page. The other features are phishing check/protection, resuming browsing session in the case of a crash, a close button for each tab on the tab, support for SVG text, etc.
The best thing about this version is that it is faster than any of its predecessors. Give it a shot and download it from the Mozilla site.