I take photos of every surface in every room, prior to move-in, plus close-ups of things that might not be obvious in a larger picture (insides of cabinets, appliances, closets, tile, etc.). I also do the exterior, to document screens, siding, porch railings, steps, yard, etc.
I also document things that are wrong: that either means they get fixed or that those things are existing & not to be deducted from the security deposit.
The photos are available to the tenant at move-in on a CD or flash drive (we also do the required walk-through); I also encourage them to take their own.
Any damage is similarly documented at move-out, plus there's a walk-through with the tenant.
Yes, it takes extra time. However, the tenant knows there's complete documentation of the existing condition (which can certainly be to their benefit) & that it's expected the property be returned in the same. Of course I allow for normal wear & tear, but it's important to establish expectations (in writing, too!) before money changes hands.
I have had one tenant leave the place trashed (mercifully, there was not much structural damage!) who then threatened to sue me for the entire security deposit; I had detailed "before & after" documentation & they had nothing. After consulting legal counsel, they realized they did not have a leg to stand on.
CYA!