Yup, Jaiku, the only real social network that has its own feature packed S60 client, has the latter finally out of 'beta' state. Here's the download link and here's the blog post announcing v0.80.

"You’ve heard us talking about it, possibly even had one of our lovely beta testers telling you how great it’s going to be; now it’s out in the wild, and ready for you to download.

The main push of this release is to let you bring the rich conversation you’ve been enjoying on our website with you out into the world on your S60 mobile, and man, has it done that. Our beta users have been saying things like “I almost never bother with the website these days” (but don’t tell our web-dev team that) and “One of the most polished S60 apps I’ve seen.”.

Other new features include:

• The choice between longer battery life or more up-to-date presence (a much requested feature).
• Reading and writing comments from and to your contacts.
• Go back in time! Using the ’stream view’ for your contacts, you can see what they were doing and saying in the past, not just their most recent post.
• More than just Jaikus! You can also see when your contacts have posted to flickr.
• Improved presence view, to make the most of your screen real-estate.
• A whole raft of usability improvements, based on what our users have been telling us they need, including an even easier to use interface, and a progress meter, so you can see what’s happening.
• More optimal data transfer and connection maintenance, giving you more bang for your wireless data dollar. "