I've been tethering to my laptop for free ever since I got my ol' Droid Eris and I'm planning to get the Thunderbolt soon. But my tethering IS my internet. So - stupid question, perhaps - but by "not free" do you mean paying for the tethering service with VZ or paying for a tethering app? If it's paying for the app then I've got no problem because I've already bought the app (Easy Tether). If it's paying for the tethering service thru VZ, then no way. They've got me paying for enough already! My Eris is rooted (the only way I've made it last this long!) and would certainly root the Thunderbolt if I get it, but probably not while I'm still within the return period.