We've just made a release candidate for BlogEngine.NET 1.5 available over at the CodePlex site. As there are a number of changes and improvements to the code base, we'll be using the release candidate to test all the new changes. Please help us out and test as much as you can with this new release.
Aside from the improvements that Al mentions on his blog, this is the first release in a while that is completely Mono on Linux compatible out of the box.
Installing BlogEngine.NET on Linux is now as easy as installing Mono, copying the BlogEngine.NET files over to your server and configuring apache. To those that have tried that before I realise that it's easier said than done, so I will be putting together a BlogEngine.NET on Mono tutorial in the next couple of days.
If you are using BlogEngine.NET on Mono, please give the new release a test and let me know your results in the comments.