Mr Yegge has some really good thoughts on how to build a large service platforms
I just finished reading Stevey's Google Platforms Rant.
Most of the attention this post has gotten is about the fact that Mr Yegge accidentally posted this publicly and how he goes on about his current company not doing things right. However if you look past the internal company politics rants and sarcasm about former employers this post is a really good article about how to build company wide service platforms.
It's really worth to read top to bottom.