I disagree a little, .ws it's a good extension and even though it stands for West Somoa or something like that sales have been rising in the past couple of years, is still low but it's catching up.
If you find a premium single word, get it and develop or sell, but don't expect $xx,xxx for a premium .ws just yet!
Here are some recent sales:
roulette.ws - $1,000 - 2008-09-20 - sedo.com
renthouses.ws - $1,300 - 2008-06-20 - afternic.com
torrents.ws - $1,169 - 2008-04-29 - sedo.com
sms.ws - $2,000 - 2007-12-08 - sedo.com
ricette.ws - $2,235 - 2007-04-25 - TDNAM
sexshop.ws - $1,330 - 2007-01-17 - Sedo
xcite.ws - $3,605 - 2006-11-25 - TDNAM
blogs.ws - $1,600 - 2006-05-30 - Sedo
voip.ws - $2,000 - 2006-03-21 - Sedo