When I first changed over to v3.0, I bought a large (3'x4.5') white board that I used with older minis, at a scale of 10' per inch.
Haven't used it since that last game, but I keep seriously thinking about going to it for my new game, using new minis and the 5' per inch scaling. Considering how my regular host uses a battlemat that doesn't react well to dry erase and I own a ton of dry erase markers in different colors, it's becoming attractive. Besides, the freeform aspect really appeals to me.
For winding movement, cut bits of wire or string to the appropriate lengths. 20' movement = 4" string. 30' move = 6" string. Lay it out where your character is moving, if not in a straight line. Or just guestimate, if you're fine with that.
8" paper plate = great fireball/etc template.
4" cardboard (bar type) drink coaster = good 10' radius template.
I don't allow 'exact' placement so as to touch as many figs as possible (mainly because I hate having players take so long to do it) AND I give "barely touched" opponents fairly good bonuses to their saves, and maybe even "they saved, so they were not affected", if I think that the player is being especially eggregious in the minutae of his spell placement. I started doing that because I had a guy who would insist on standing over the white board for the longest time, trying to 'place' his spells very precisely. Heck, for a time I insisted that he drop the template from at least 4" above the white board. But that got hard on the figs.
