I'm sure that Sitefinity for Documentation
could be great, but I'm also having a hard time accessing some kind of Sitefinity API reference. Preferably something like the MDSN Library, having short samples and cross references.
I finally accepted to use local help for VS2010, to be able to install the SF API reference from the SDK (5.0.2500.7), but each page has a red text like this in the top:
[Missing <summary> documentation for "N:Telerik.Sitefinity"]
I guess this particular CHM build had an issue.
Online API is better for communication.