This was originally posted to the Ultimate Ultra-Mobile PC blog:
A coworker sent this article to me. This article goes pretty deep into understanding the technology behind Solid State Drives (SSDs) and how their performance changes over time. Solid State drives are going to become the norm in a few years as their cost per gigabyte declines. Despite SSDs being much much faster than normal Hard Drive Disks (HDDs), they have quite a few draw backs including degraded performance after continual use, you pay for space you don't use and they have a limited lifespan.
This article also makes mention of the TRIM query / function that may eventually be supported in Windows 7 and how that can help offset some of the performance declines. Anyways if you have contemplated installing an SSD in a UMPC or any computer you should read this article.