A couple of weeks ago I went into the dot Mac iDisk Software > Members Only folder, which hosts free software for dot Mac subscribers. At that time, I was able to download three of the four listed Garageband Jam Pack samplers (the fourth would always result in an error), something I should've done long ago (they've been there since GB1, I think).
So I decide to go back today, to check if they've fixed the link to the fourth Jam Pack sampler. To my surprise, all four have been taken down. In their place is a single Jam Pack Sampler World Music dmg, which is like a 60MB download. Of course, I downloaded it right away.
I guess It pays to snatch whatever free stuff you can find, you never know when they might just disappear.
Get it while it's hot.