Western Digital Scorpio Black WD3200BEKT 320GB 7200 RPM 16MB Cache 2.5" SATA 3.0Gb/s Internal Notebook Hard Drive
Great drive and reportedly 10-15% faster seek/read/write times over the stock 120 gb drive.
The M1330 with latest firmware upgrade A015 now supports up to 8gb of RAM. (Note: You will need a 64-bit version of Windows for 4gb+).
You can install 4GB of RAM with 2 2GB CORSAIR 2GB 200-Pin DDR2 SO-DIMM DDR2 667 (PC2 5300) Laptop Memory Model VS2GSDS667D2 chips. Best performance comes from matched set of chips. Buy 2!