The main reason I moved is because I was unhappy with the hosting (aff) provider of the main site. Recently they moved to faster servers and a better internet backbone, but after moving there are still ongoing issues with some of the other sites that run there.
The second reason is, I wanted to see how well Google and other search engines will pick up the 301 redirects (permanently moved pages) and hold my current rankings in the search results. Another part of this SEO exercise is to see how the rankings and number of visitors to this site are influenced by the move of a Dutch hosting provider with servers in Amsterdam to a USA-based hosting company JustHost.com (Geo Targeting in Search Engine Optimization).
After the dust settles, I will write a page/post about the process of moving a WordPress site. I've already found one major problem that is now fixed, but I need to do some more testing and tweaking to be sure. After that, I will give you a complete overview of all the pitfalls to avoid in a process like this and how to handle it the right way. Subscribe to the e-mail or RSS updates on the right side of the menu to get those updates.