This is Intel's 3rd generation of consumer Solid State Drives. These 320 Series SSDs just became available for sale -- some posted as recently as March 28, 2011, on Amazon -- and they are faster than the very popular 2nd generation X25-M SSD products from 2009 and 2010.
The X25-M drives are still around, but they haven't dropped much in price. 40GB still costs around $100 and 80GB still $180-ish to $200. So if you're looking for an upgrade to your laptop, we highly recommend the new 320 Series instead of the older 2nd generation. You'll get the new technology, faster performance, for really close to the same price.
Dealzon guys Ian and Jonathan put 80GB Intel SSDs in their MacBook Pro laptops in 2010 and they're still running smoothly. They'd go for this new Intel 320 Series SSD if they were upgrading now.
Intel SSD model numbers
Notice the end of the model numbers on these SSD products. "G3XX"
G3 indicates it's this 3rd generation. The previous X25-M models said G2
the two characters after G3 indicate the type of package and its contents
"10" means OEM, and it's just the SSD, no frills, and usually the cheapest
"K5" is a kit the SSD, install guide, and desktop install kit (drive bracket and screws, SATA signal cable and SATA power cable)
"B5" includes desktop AND notebook install kits (desktop: drive bracket and screws, SATA signal cable and SATA power cable....and for notebook, USB to SATA cable, protective sleeve and screwdriver.