A few of the good blog entries I have had the pleasure of reading the last few weeks.
Writing Great Unit Tests: Best and Worst Practices by Steve Sanderson. This entry is just an overview of unit testing, but really well written. Also Steve placed a few nice charts in defining unit & integration tests. The combination just made for a nice refresher, or for the test newbie, a great introduction.
Gergely Orosz has some articles on NHibernate versus Entity Framework performance; Thoughts on ranking ORM tools, NHibernate vs Entity Framework: a performance test, and Nhibernate vs Entity Framework ? a revised performance comparison. The interesting conclusion is that there is no good effective way to compare ORM platforms. I suppose, it best to compare on the specific metrics you desire in an ORM platform, then choose.
The REST for ASP.NET MVC SDK entry is a good read. First off it states what it is and why you would want to use it, which would be helpful for many. It caught my eye solely because I would have loved to have the functionality 10 months ago for a project, instead of manually developing all the bits. At least it is out now and I will surely be using it as such.
Last but not least, there is the Facebook & ASP.NET MVC entry. This is a useful entry, being I have just jumped onto a project doing some Facebook Development this is a very helpful entry in getting up to speed.