I think I would only use spotlight for contacts and because of that I use voice control more. Especially if the rumors are true about voice control working through bluetooth headsets, then I'm all set!
Spotlight sucks compared to Quickgold, the original Jailbreak search feature. Plus, Spotlight can't find apps that are organized into Categories.
i can't figure out how to implement it in my iphone usage. personally, i keep everything so organized that i don't need it, but i could see where your unorganized corporate douche would need it.
I actually wish I could just disable the spotlight feature. It annoys me when I accidentally scroll into it and have to scroll back out.
I have used Spotlight several times since upgrading to 3.0. While it is not used every day, it is sure handy when I can't find what I am looking for. I have 502 contacts in my list and sometimes it seems easier to use Spotlight to put in the first few letters of the name and let it find the contact for me.