Wget

Using wget to retrieve files that require you to be logged in

Save the cookie

wget --save-cookies ./cookie -O - URL> /dev/null

for rapidshare.com see my script to get the cookie

Use the cookie!

wget -c --load-cookies ./cookie URL

Useful parameters

-c is used to resume a previously started download
-i <filename> is used to read a file containing 1 URL per line
--limit-rate=<rate>k is used to limit the download rate