There are lots of ideas at http://www.macosxhints.com/article.php?story=200602101154178... (first hit from http://www.google.com/search?q=Mighty+Mouse+with+the+scrollb...). Most of them seem pretty close to Apple's suggestions at http://support.apple.com/kb/HT1537 - sometimes with alcohol instead of water.

Mine hasn't needed cleaning yet, but it's less than 12 months old.

If you turn it upside down, press down hard and roll it usually get's unstuck. I'm pretty sure this won't work forever but it's kept the mouse alive for now.

I'd take these 'failures' any day! While the ipod had an innovative design for scrolling through a long list of music, it was the decision to make white earbuds that was so mind bending. Now people knew you had an ipod even if it was concealed. Brilliant.

In fairness, it's given an aside in the Hockey Puck Mouse section.