Here's something developers both new and experienced can all enjoy together. Doug Rathbone, writer of Diary of a Ninja has posted a very useful list of tools Windows Phone developers can use to make life that little bit simpler.
I'll let the full list do most of the talking as Doug has done an excellent job of summarising each of these tools and exactly why you should consider using them, but suffice to say there are several here that I hadn't heard of before. I'm particularly keen to try out SilverLight Spy, a Firebug-like tool for tweaking and adjusting your app's GUI on the fly.
Have you used these tools? Are there any you swear by that don't appear on this list? Let us know in the comments!