Walt Mossberg at the WSJ already gave us the big picture of the new Thinkpad X300 notebook in his review this week. Now NotebookReview has published a review of the X300 that looks at the performance of the lightweight notebook in more detail.

Update 02/26/08:
Thinkpad X300 ships

Quote from the review: "Let's get this straight; the ThinkPad X300 was not built to compete with your Quad Core processor loaded desktop. The name of the game with thin travel notebooks is using a low voltage processor to conserve power and reduce heat build-up. The ThinkPad X300 uses an Intel 1.20GHz Core 2 Duo L7100 processor that's quite capable of running office applications and performing any general web related tasks, but will not serve well for 3D graphics applications or any heavy duty rendering tasks.
The Intel X3100 will allow you to play a few light games, maybe even Half Life 2 on low settings, but in general you'll want to stick to e-mail, web browsing, Office and photo editing tasks. That's enough for most, and certainly enough for on the go business travelers."
Read the full review on NotebookReview.

Lenovo is slated to ship the Thinkpad X300 next week.