At the last few conferences I've presented at, there have been questions about using SSDs (Solid-State Drives) for enterprise storage and whether that will change some of the database maintenance practices. My answer to that is "I don't know" (ha – bet you thought I was going to say "It depends!") because adoption of SSDs is very low. I haven't been able to find much info about using them, but the Microsoft Research group in Cambridge just published a research paper Migrating Sever Storage to SSDs: Analysis of Tradeoffs, which does a nice job of walking through the issues involved and concludes that for the majority of workloads, it makes more economic sense to host them on HDDs. The exception is for top-end OLTP databases. I'll warn you that this isn't a whitepaper – it's a research paper, and gets a bit deep into algorithms and mathematical analyses, but if you're up to the challenge it's a great read.
You can download the paper from http://research.microsoft.com/en-us/um/people/antr/ms/ssd.pdf. Enjoy!
PS I found it on James Hamilton's blog.