I'm using one JD2 for low speed hoster with free accounts and one JD2 for high speed hoster with free acc. K2S is low speed (30kB/s) and depositfile is faster (200kB/s). I don't have the same link on each JD.
Depositfile, filemonster, ... in first JD2
uploadto.us, uploaded.to, rapidshare, rapidgator, fileboom, keep2share, ... in other JD2.
Like this I can download from both slow and fast hoster with only free accounts. For example if i run rapidshare, fileboom, keep2share with depositfile, the highspeed of depositfile may cause other slow hoster to stop downloading, I have a low bandwidth. Also I can download from only one fastspeed hoster at a time