What blogging API to use?

["redevries" <rene.de.vries@howardshome.com>]

I hope this is the appropriate place to post this question. 

We're using a home-grown content management system on our Intranet. I 
want our users to be able to use the popular blogging tools to post 
to this system. BlogJet is a popular tool. However, I see there are a 
number of back-end api's that can be used, such as MovableType and 
the Blogger API.

Since I will need to develop this backend from scratch, what is the 
general recommedation on what to use?

Thanks in advance,

René de Vries