One of the valuable ones that I can spot is daz.com, "Daz" being a popular Procter & Gamble brand of soap powder (at least, in the UK): http://www.dazwhite.co.uk/ - I'd guess they'd quite like the .com for their brand.
The domain was regged in 1998, and if the TM was registered after this date then it should be okay.
There are pushes by some US law makers (e.g. the silly Senator Olivia Snow) to change this so that TM holders have much more rights over domains, even if the domain existed before the TM, but for now it should be fine.
Would be worth consulting a domain lawyer if an offer is made for it though.
A company called Mills Brothers BV hold an internationally registered mark "Daz" in classes 18, 25 too.
I'm sure there are several others.