I don't know if a .ws could generate some type-in traffic even for a single word (and UMTS.ws isn't an exception), honestly i think not.
But at least ".ws" is a bit catchy and easy to remember, and there is only a small amount of catchy top level extensions (com, net, info, org, biz and maybe .ws - website).
So i thought: "short single word with good market behind; why not try for 7,5 EU?".
About the .ws, i don't know if it will grow.
There are tons of coming new extension, and with a .travel, a .job, a .xxx, a .everythingelse; i think that .com will surely keep it's value (because now it's a point of referement for everything associated with the internet, and the pentasyllabe ta-ta-ta-dot-com sounds familiar to everyone), but .net and .org value will go a bit down.
And taking in consideration that tomorrow there will be personalized extensions, i don't know how much .ws can grow.
What are your opinions about .ws?