Indeed, a good digger is a must, but keep in mind that you don't really want to bring a full sized shovel for digging in a city park or someone's yard(with permission granted of course). Common sense, but you'd be surprized at some of the stuff I've seen. A shovel is fine if you're out in the country/relic hunting and whatnot. For general purpose/coin shooting, etc, all you really need is a garden trowel. Walmart sells a decent one for around five bucks. Lesche is prbably the best digger(not sold at Walmart, but available at KellyCo or any number of dealers and alot more than $5). Comes with a nice sheathe the fits onto your belt, it's virtually indestructable and has a nice serated edge for cutting through roots(which can really be a pain in the neck when you are trying to recover a target). I also carry a plastic trowel type digger for scooping out bits of dirt and checking with propointer or waving over detector searchcoil.
You'll also need a pouch/pocket/ bag/ contaner for your finds and a seperate one for trash. I use a "Sidekick" pouch for my trash targets and use a Garrett three pocket treasure pouch for the goodies. A really good and very affordable alternative is to just use one of those roofong/construction nail aprons. These have two pockets so you can keep trash in one and goodies in the other. Available at Home Depot, Loews, Ace Hardware, etc.
Knee pads are important as well to save your knees from some pain as well as keeping your pants from having dirt spots/grass stains on the knees. I have some really nice, rugged, comfortable, gel padded(expensive) knee pads that I use while nugget shooting 'cause that desert ground can be like cement. However, you can get some disposable foam type kneepads at Home Depot for a couple bucks. I actually use those alot.
A hat is really good to have, just to keep the sun off of you. Also along these lines would be sunscreen, sunglasses, gloves, water bottle, first aid kit(for car).
A decent GPS device is always good to have. Not only to pinpoint your location, but they can also tell you where parks and different places of interest are located. Also, if you find a really choice spot that you would like to return to later, you can save the location/GPS coordinates to bring you right back to that exact spot.
A drop cloth/rag/towel is also good to have so that you can place the dirt from the hole that you've dug onto and just drop it back into hole when you are done.
Here is a decent video on digging a plug to recover your target:
http://www.youtube.com/watch?v=EemmbOHr39Y&feature=PlayList&p=339AC9A67B344BF6&playnext=1&playnext_from=PL&index=9
Oh yeah, and a good probe is necessary as well. Garrett makes a really nice brass probe. A srewdriver will do, but you really want the tip to be dull/smooth so it doesn't scratch the target.
That's about all that I can think of right now. I'm sure that others will chime in with some good info. An important thing to remember is that you don't want to weight yourself down too much with unecssary accessories Be comfortable and get ready to get dirty

Have fun!

Best of luck to ya!

Happy Hunting!
