Are you talking about a resource for deciding what items to register for, or what stores you should choose for your registry/registries?
If you just want a sample list, you can look online at the websites for Martha Stewart Weddings and The Knot. Stores that offer registries typically offer suggested checklists as well, either printed out at the store and/or online.
If you are asking what stores to choose, that's up to you. Think about what's in your area, because you'll have to travel there to register and maybe exchange/return stuff, so you don't want to pick a place that's a six-hour drive from you. And you also need to consider what's convenient for your guests, so don't pick a store that's only located in one state (assuming you'll have people coming in from other areas ... if your whole guest list is local, then by all means go with a local-only store).
You also need to offer a wide range of prices. Don't pick a store where everything starts at $200. By the same token, don't register at the dollar store because some people will want to get you a bigger gift. Pick a store that offers variety. Register for several things under $25, several things $25-100, a handful of things $100-200, and possibly a couple things $200+ (sometimes a close relative or a group of people/the bridesmaids chip in for one large gift).
It's O.K. to pick two stores, MAYBE three if the third is a very unique store (like if you pick Macy's and Target but go with something really upscale for your crystal and china). We went with Macy's and Bed Bath & Beyond.
Other options:
Crate and Barrel
Wal-Mart
Target
Williams Sonoma
Sur la Table
Kohl's
Dillard's
JC Penny
Tiffany's
Bloomingdale's
Pottery Barn