What would you serve with crab cakes?

I think shaved vegetable salad would be lovely (fennel,zucchini, radish, asparagus, a red carrot if you could find it) with lots of lemon & mint & black pepper (edible flowers??) would really off set the richness of crab & compliment the flavor as well.
or Shaved Fennel & Pink Grapefruit salad, or just a Herb, Pansy & Radish Salad or Pink Grapefruit & Avocado- Rich but delicious.

I've seen then served with Mashed Potatoes and a Buerre Blanc,if you are looking for a warm dinner kind of side, I'd puinch that up with a herb & radish salad.

I tend toward a slaw, but any vegetable dish or salad with a lot of acid is a good counterpoint to the rich crab cakes.

asparagus

Corn! In any form.

One of my crabcake sides that I've been served is a corn and edamame sauté. I guess you could think of it as a really refined succotash, also a great pairing I think. It was served in a lobster emulsion and uni butter which may be a bit more difficult for the home chef to pull off.

This: http://lapadia.wordpress.com/2011/01/12/apple-jalapeno-slaw/

p.s. It offers a nice crunch in contrast with the softness of the crab.

I also like asparagus (tender-crisp) or something crunchy like pea pods, with any kind of light, lemony vinaigrette with crab cakes. You can skip the tartar sauce if you're lightly saucing the veg with a lemon vinaigrette.

Celeriac remoulade, or celeriac and fennel remoulade.
There is also just plain old remoulade sauce:
http://www.cookingchanneltv.com/recipes/emeril-lagasse/crabcakes-with-remoulade-sauce.html

I usually serve a combination of the above answers: a simple green salad with bright flavors: arugula, grapefruit, walnuts with a light vinaigrette.

I'm a big fan of having a chunky, citrus-y gazpacho with crab cakes. The clean acidic flavors from the vegetables compliment the sweet richness of the crab meat really well. Incidentally, my favorite local place to order a crab cake serves a mean Bloody Mary, which I would recommend as a "side dish" to crab cakes if you're a sassy sort of hostess.

Cole slaw is typical, but you could serve it with just about any vegetable. I had a crab cake for dinner on Sunday night along with asparagus and tomatoes.

Depends on what you want. Just a green salad and crabcakes can be a perfect meal.