@Mortensen
G+ API have been released a week ago or so. Unfortunately, they only provide the methods to read the information, but they do not provide any method to post (write) to G+.
Anyway, Google said full API will be provided shortly.

I never wrote something for Maemo, but I'm a developer and I'm interested in this application too. If someone is already working on this, or if someone wants to start this application, please contact me; I could help you.