A few bits of information I have picked up today
Enterprise - S4 confirmed - but will be the last unless viewing figures improve.
Andromeda - S5 should have started filming on May 25th.
Babylon 5 - Rumours of a film are very strong - still awaiting confirmation from JMS.
Stargate - The Atlantis spin-off debuts on the Sci-Fi channel in July. The main series Season 8 also lauches in July.
Dr Who - The BBC have (apparently) settled with Terry Nations estate to allow the Daleks to appear in the new series. The first episode "aliens" are rumoured to be the Autons.
Firefly - A film ("Serenity") with all the cast is in production.
Battlestar Galatica - The series in in production for a 2005 debut.
Dead Like Me - Series 2 is in production for (I think) the Autumn.
Charmed - Rumoured that Season 8 will be the last, not bad considering that S7 hasn't launched yet !.
On a side note - Both incarnations of one of my favourite baddies - "The "Master" from Dr Who - are now deceased. Roger Delgado (the original) died in the early 1970's - His replacement (Anthony Ainsley) passed away a few weeks ago - he was 71.