I know of MeePlus, but it is very limited as of now. I'd like to see more Google+ integration on N9 in the future, with stream content sent to my Events feed, a way to manage my circles on my phone (via Contacts or via app) etc.

I'm beginning to like it so much more than Facebook, it's a pity there are still a few people (but it can also be a plus for someone).

There will be more and more people everyday !
But a good app is a long time away.
Hope we can get a good one and maybe also for the n900 users.

AFAIK, the main issue is that the Google+ API for external applications is very incomplete and read-only. Since Google builds the app for 75% of the market themselves (iOS and Android), they seem to be OK with it. I see to indication of ongoing work on the API.

Any news? Has something changed with the API issues?

I would also be glad to help any way I could in the development. That is, for example, translation. I work as translator for an Italian boardgame publisher and as of now I translated to Italian EvidenceHunt, Organiser Feed, Butaca: cinema information, FM-radio (for which I'm also doing betatesting on the upcoming 1.0.0 version, which is a blast) and I'm going to translate also gNewsReader.