Acer will ship soon(?) a new CDR-W drive "CRW2010A" that supports 20x writing, 10x re-writing and 40x reading speed. We haven't got any news about the drive's shipping date/price for now...The drive supports "SeamLess-Link" and has the following features:

20X Writing, 10X Rewriting, 40X Reading
2MB Buffer Size
Flash Memory / Upgrade System
E-IDE / ATAPI Interface
Popular Recording Software Package
Anti-Vibration System
Emergency Eject
Dust protection design
Power Saving Feature
Writing Modes: Disc-at-once, Track-at-once, Multisession, Packet writing, Raw writing(!)

No information about the drive's 20x writing speed technology (P-CAV or Z-CLV). Have you noticed that Acer officially supports "Raw-writing"? ;-)