I absolutely agree with you on the best apps being lean.

Google docs are a great example of how you can take essential features from a complex application (like MS Word) and still make it work perfectly well (and as such transport it to other delivery media), but in the case of Jaiku and Twitter there is a fundamental benefit to Jaiku.

The beauty of Jaiku though is that it allows conversations to take place under a single 140-character statement. Conversations flow, people join in. Just like blogs.

Take that mobile (with the S60 client as well as SMS, like Twitter) and you have an awesome combination of mobile micro-blogging (threaded conversations stemming from a single statement) and life-streaming (140 character updates).

To respond direcdtly to your comment, I agree, more is not always best, but in this case, I still strongly believe that Jaiku does a vastly better job than Twitter.

Good web apps are lean.

If you look at the evolution of classical traditional software apps, they’ve suffered immensely from gradually becoming huge bloated pieces of software – MS Word, for example.

Abundance of features does not equal better.

and an interview of Jyri Engestrom co-founder of Jaiku
http://uk.intruders.tv/Essential-Web-07-Interview-with-Jaiku-co-founder-Jyri-Engestrom_a98.html