If you liked charmed for the ladies then you may as well watch Xena and Relic Hunter!!
I didnt like 'dead like me' at first, but im actually getting into to it again now, its very much down the lines of of scrubs in terms of a lesson an episode and often depressing humour, but still, it grows on you!!
avoided 4400 so far, went off 24 in the 2nd series, Lost I havent had the chance to watch yet, the shield ive avoided but is on my list, Alias was fun but daft (never has a show had so many extreme twists from episode to episode).
Babylon 5, now there was a show I loved. I say loved because I havent seen it for years and years. the last episode I ever saw was spoiler --------->
set many thousands of years in the future, i think first 100 years, then a thousand, then some silly number. the bit I remember twas the main characters being brought back as holograms, though they didnt know that they were until garibaldi figured it out and totally kicked ass... 
. I never got into the sequals.
I'm adding 'Oz' to the list, a hard hitting prison drama set in the US (Oz standing for Oswald Penetentiary). Now this is one brutal series, there are no happy endings and much brutality, incredible intensity that keeps you hooked for many hours on end.
m.