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It doesn't work - There's a javascript error

WP-Picasa uses mootools. If you have another plugin which uses jquery, then there is a conflict. Somewhere I have seen a solution for this, but don't remember where. Search on forums and use google. If I happen to bump on it, I'll link it here.. Or you can e-mail me the link if you happen to find it :)

I tried to put my albums name to albumid setting but it didn't work, why?

Because albumID numbers are not album titles or descriptions. They are unique identification numbers used internally by Picasa. You need to study picasa a bit to know this, so I'll help you out so you'll find it easier. Go to Picasa web albums (not to software, browse to picasaweb.google.com/[YOUR_USERID]) then open album you want to embed. Now, find RSS somewhere on the right side of the screen (in the grey bar) and open it, or check where it points. Address looks like this: feed://picasaweb.google.com/data/feed/base/user/YOUR_USERID/albumid/ALBUMID so - copy albumid number from that link..

What about future support for flickr and other similar systems?

Nope. This was it so far..

Are there multiple languages supported on wp-picasa?

Yes. I provided english and finnish. Someone else may provide more.

I tried to browse pictures with carousel but even though carousel detects multiple pictures, carousel is empty, why?

Are you maybe using Safari, Chrome or Firefox? I suspect that you have AdBlock extension enabled. Disable it and it works. AdBlock seems to be hiding carousel..

It queries xml requests from picasa's rss feed and caches them?

Yes. Cache age has been set in common.php - it's as seconds and is initially set to 7 minutes. Change variable $cache_time if this doesn't suite your needs.