Start off with the Slots Directory because the guy that puts that list together is pretty good at picking out sites.

Of course there's an online bias to OnlineSlotPlayer, but if you're looking for sites that deal with the kind of thing you can touch (and put in your rec room), browse through the Slot Equipment at Yahoo.

My wife told me that SlotCharts.com is probably one of the best slots resources on the net. They don't allow visitors from the US though.

Free Online Slots - Play the most realistic slots and win cash prizes at FreeSlots.com! - well, that's their catch-phrase. Truth be told, there's a lot of free slot machine action going on there, and I'd put them in the top of all the "for fun" slots sites on the net.

The Slots Prophet lists several of the online casinos that focus on slot machine players. Give bonus info as well. The same can probably be said of the Freeslots guide, except that they have a bunch of machine reviews as well.

Slot Machines, Free Slots & Casinos - Search-able directory of slot games online. Free bonuses and reviews. - actually, not the greatest slots site, but there's information in there if you're the type to be digging through directories. And, if you've made it here, maybe you are!

Two other cool slots sites are:
Slotadvisor.com - Where to play, how to win. - AND

SlotsCoach.com - Outsmarting the Online Slots

I like the guy who does those sites. Some good info too, from the perspective of someone who plays the games, instead of say, someone who works in a casino marketing department. Thumbs up on the Slot Advisor as one of the top slots sites on the net.

Another player perspective can be found at the slots blog called SlotsAdventures.com. These tales are usually from online play, but from time to time a real world (instead of cyberspace) casino tale slips in.

It's fun to hear players talk about playing, that's good stuff to me.