IE7 was released last week (while I was on holiday). It’s the first new version of Internet Explorer for five years. It’s really catching up with Firefox and Opera, with a host of new (to it) features. It’s also meant to have much better security than IE6. A shame that a security vulnerability was discovered within about a day of its release.
I haven’t tried it yet, but, however good it is, will probably stick to Firefox. Most security attacks are targetted at the platforms used by the most users, so even if Firefox isn’t inherently more secure it’s likely to be more secure in practice.