When is a netbook no longer a netbook?

One of the latest netbooks to appear on the market is the Lenovo IdeaPad S12. This machine has a 12.1" screen, so is it no longer a netbook? At $500, it's priced really well compared to other 12" ultra-portable laptops out there. Lenovo calls the S12 a "roomy 12" netbook" so they're clearly marketing the S series as netbooks.

At some point, someone will have to come up with some clear definitions on what constitutes a netbook vs. a notebook, etc. Microsoft had come up with some definitions for the term UMPC (ultra-mobile PC) back when they launched the Origami promotion. These were the specs for an UMPC:

• Windows Vista Home Premium OS
• Approximately 7" diagonal display (or smaller)
• Minimum 800 x 480 resolution
• Approximately 2 pounds
• Integrated touch panel
• WiFi- and Bluetooth-enabled
  

Well, as Windows 7 replaces Vista and XP, it should be interesting to see how mobile computers get defined and labeled.