Lots of passwords stolen

Seems like a lot of sites have had security breaches recently.
I assume lots of you have already heard of LinkedIns' users passwords being stolen, about 6.5 million of them in fact. However, it seems like the same people have stolen about 1.5 million passwords from the site eHarmony. It doesn't end there though, because passwords have leaked from Last.fm as well.
Seems like Reddit might be involved as well, but nothing is confirmed yet.
So if you use any of these sites, update your passwords and preferably use different passwords for each site.