2005 will be the year of the new browser wars for sure. Although Apple’s Safari RSS did not seem much more than a few bug fixes and RSS support, the announcement of IE7 was a good sign of the impending battles between all the browsers. However Firefox 1.5 is coming closer to beta, as you can see it is already in Alpha 2.
If you decide to try out Deer Park, make sure you disable the ImageZoom extension as it has a bug that causes DP to render some text underneath the status bar. Other than that Deer Park is pretty good at disabling extensions that are not compatible.
If you just can’t live without a theme, according to this post on the Mozillazine forums, there is a version of Qute already ported for Deer Park.