I've moved to a different hosting service, hence some of the teething troubles over the last couple of days. I've learnt a few things about hosting Movable Type on a Windows system with IIS and moving exporting/importing a blog from one Movable Type installation to another. I'll write these up at the weekend.
One significant change is that I don't have to worry about bandwidth charges anymore and I have switched to full content in the feeds. Also, I can now use ASP.NET and will be setting up various sample XML-RPC.NET services.