This nifty tools lets you know if any links for rapidshare, megaupload, filefactory etc. is either dead or alive.
Got firefox? Good. Step one done.
Next, install
Greasemonkey add-on, restart and
grab this scripts. Check it by browsing to any rapidshare (etc.) weblink you can find.
Very useful little tools, already use it for almost a year and it never disappoints.
ps: Always check for the updated scripts tehre.