[can I use it with mac ibook to burn dvd+RW +R and/ or dvd-RW -R??]
Maybe, but only with OS 10.3 or newer, and probably only with Toast at this time. Apple does not officially support anything except DVD-R
[Do I need a mac driver? ]
No Mac driver, it'll either work or not, but check at xlr8yourmac.com for possible reports from users of this drive.
[can I use iDVD or toast for burning?]
iDVD does not support external burners at this time. Not sure about the new version with iLife 04. Toast works with most setups.