I don’t think there is an easy way to add the inbuilt RW Blog to a Foundation site but some users have managed to do it using Pluskit.
The MicroBlog is a great way to add a basic blog if you are OK with the Tumblr interface and the reliance on Tumblr.
I have just added a PulseCMS blog & CMS to a Foundation site and this was by far the easiest and quickest blog I have used. Literally, you edit a text file, and add a folder to your server and you are done. There is a video that claims it is a 3 minute setup but you will find yourself with time to spare:) When you consider that it also adds Login security, CMS text & images, Sliders, Galleries, backup, an editable Contact Form and Newsletter Signup as well as a Mac admin App , it is very impressive. Using the Instacks solution, the current cost is less than $30/domain which is money very well spent considering how quick and easy it is to use. The icing on the cake is that you can use PulseCMS to build a fully featured Gallery using Gallery3.
TotalCMS does some more specific things and is $100/domain.
It’s become very hard to make a decision to choose “the best” Blog with so many great solutions available now. They are all really good, but you need to clearly define exactly what features you want before deciding on a solution.