1) GMAT_Official_Guide_10th_edition (2004)
2) GMAT_preparation: A lot of sample papers and other stuff
3) GMAT_preparation: FlashCards
4) Official Guide 11 Verbal Review
5) GMAT Test Code 55
6) English Grammer Workbook for Dummies
7) GMAT Notes
8) Manathan GMAT Archive
9) Manathan Sentence Correction 2003 Edition