Looking for lactose free dessert or even main dish

are you really looking for lactose free or are you wanting dairy substitutes? i have not found many useful substitutes but many people are actually bovine casein sensitive and not lactose intolerant - it would be good to be sure, because goats milk, etc could be a great substitute...with that said, if you want a dairy free dessert recipe, just make this one with margarine: http://www.hannaford.com/ensemble/Desserts-cookies/Cookies/Peanut-Butter-Chocolate-Chunk-Brownies/c/28783/sc/28789/10272.uts

My Raspberry Brownies are dairy-free and gluten-free:
http://www.food52.com/recipes/12472_raspberry_brownies

I agree with hardlikearmour; "dairy free" or "vegan" are more common tags for searches.

search "Dairy free". I recommend my own coffee blender mousse, but chocolate dipped fruit and oil based brownies are both reliable. For non chocoholics, baklava, meringue and nougat are good bets (another reason to not search vegan is losing the eggy options).
As for main dishes: simple meat/fish + veggie cooked in olive oil is a basic choice if you mix up the seasonings, meats/fishes, and veggies. Also pasta with tomato is df. I would note that using anchovies is a nice dairy-free umami for someone who likes cheese but can no longer enjoy it.

Lactose free main dishes are legion. My favorite winter dishes contain no lactose. Boeuf Bourguignon, Coq au Vin, Chicken in the Pot with 40 Cloves of Garlic, the list goes on and on.

godairyfree.org is a good place to look for dairy free recipes. I'm a professional baker and have been lactose intolerant for 20+ years, so unfortunately(!) I have had some experience w/ this. RE: Pizza-a lot of aged cheeses contain just low or min. lactose; you have to find your personal tolerance level. There is a brand of cheese-Cabot-sold in most grocery stores that is advertised as lactose free. I have yet to taste a cream cheese frosting w/out cream cheese that tastes good; sometimes you just have to eat the real deal and suffer the consequences.

AMEN to the Chocolate Mousse! While I've seen many recipes that include whipped cream, the one I've always made does not. And there's always requests for seconds and never, ever any left.

Chocolate Mousse! For example, Elizabeth David's brilliant classic (from French Provincial Cooking.)

Take an ounce of chocolate and an egg for each person. Melt the chocolate, adding a tablespoonful of strong coffee, liqueur or brandy per person if you like. Stir in the egg yolks. Whisk the egg whites until just stiff, then fold them together with the chocolate. Pour the mottled, unpromising looking foam into oven-proof ramekins then put them in the fridge. The mixture will set to a smooth, dark mousse.

Should the urge take you, dredge them each with a teaspoon of caster sugar and bake at 400F for 6-7 minutes (not longer or they will toughen). Eat them instantly.

Try searching vegan instead of lactose free. It's more restrictive, but I think more people use it as a tag.

I find that most dairy substitutes, vegan cheese being a perfect example, are disappointing. You can make plenty of dairy-free desserts like sorbets and fruit desserts. Cakes and cookies are generally ok since there is no lactose in butter. These are really tasty lactose-free desserts:
http://www.food52.com/recipes/6857_grownup_birthday_cake
http://www.food52.com/recipes/12934_the_river_cafs_strawberry_sorbet
http://www.food52.com/recipes/5500_peaches_poached_with_basil

If you really want pizza, make vegetable pizzas and skip the fake cheese.

Merrill's recipe for Berry Summer Pudding is lactose free if you don't finish it off with cream. The recipe is here:

http://www.food52.com/recipes/13392_berry_summer_pudding