I'm implementing a mobile-friendly version of our corporate web site and will be using WURFL to detect mobile browsers and redirect them to our mobile site. Having recently purchased an Android tablet, I've found that many sites consider it to be a mobile device even though it has a large 10" screen and it's perfectly capable of handling sites designed using standard desktop resolutions.
My plan is to use WURFL, examine the device capabilities and treat anything with a resolution width of less than 700px as a mobile device, but I'd like some input as to that sweet spot for determining mobile vs desktop.