1TB:
Green: $90, 5400rpm, 2 year warranty
Blue: $100, 7200rpm, 2 year warranty
Red: $110, "Intellipower*", 3 year warranty (* "fine-tuned balance of spin speed, transfer rate and caching algorithms designed to deliver both significant power savings and solid performance. For each drive model, WD may use a different, invariable RPM.")
Black: $120, 7200rpm, 5 year warranty
RE4: $150, 7200rpm, 5 year warranty
I'm glad Western Digital released these drives. Looks like they'll be a bit more reliable and likely work better with RAID arrays than the Green line at a slight cost premium. It'll be nice to have better storage drives than the Greens without dropping the extra $$$ for Blacks or RE4s.