Thanks for Embedding Flash Animation into a new Moodle Block, it gives me some hints what a block is, but still my shoutblock don't work.
So I give it up and turn to include it into footer of every page so that it can refresh itself when people move from page to page.
It works !
And that is enough for me, although it doesn't look smart.
Hope that someone interested in shoutblock will make a smarter look for it in the future.
Thanks again for your interest.
But there seem to be another problem to overcome, how can members login automatically when they open their browser for the second time without the need for login again ?
Most members of my site feel unconvinient and don't want to login until they have to (post or reply topics,etc) so they will not appear on the Instant messaging sideblock.
You can file a new bug at the bugtracker requesting that functionality though.