You are partially correct. Tiffen Dfx has a film stock grouping of film replication presets, but DFT Film Stocks expands on the overall amount of film specific presets offered. Very similar (basically identical) layer based interface though. If film like presets were the only goal, I think DFT would be the better bet, but Tiffen Dfx includes a ton of different types of filters from color filter replications, to catch lights, toning, etc. Pricing also reflects that though too.

There are tons of free presets out there, and talented people sharing them (and I fully endorse supporting these folks by way of donations or the like). Not to try and take anything away from people trying to sell their presets, but I’ve not seen any Aperture or Lightroom presets that I’d feel are worth the money that most people selling them are asking. Photoshop actions, yes (as they are much more complex potentially), but just slider tweaks in a host program like Ap3 or LR3, nah. It may just be me, but I like the idea of using a fairly topical program like Aperture or Lightroom to share presets that we’ve collectively come up with as a community myself. Check the presets post here:

http://tysonrobichaudphotography.wordpress.com/2010/07/28/presets-less-talk-more-rock-or-one-easy-way-to-streamline-your%C2%A0workflow/

Lots of links to freebies, etc.

Cheers!