I've been growing edible stuff in my garden for a number of years now, after planting a plum tree when i first got the house and tasting how much better they were than those from the supermarket.
This year i decided to step it up a little, so i've slated over a 4m x3m area at the bottom of the garden hidden away behind the garage, and got to work adding raised beds etc.
The raised beds are pretty cool - about £25 each from crocus, 1m x 1m x 0.25m and made out of black plastic (so retain heat better). I think wood would have looked nicer, i originally looked at railway sleepers, but the recycled ones are heavily treated in (creosote?) which has now been found to be more carcenogenic than originally thought so not good for around food, and modern sleepers are treated in a deriviative of arsenic, which might be okay, but didnt really appeal!
The huge propogator things are from B&Q for £5 each - really useful for getting the seedlings started, and just as importantly for stopping the local cats from using them as litter trays (grrr) (hence the reason theres (home-harvested :-) bamboo over the bed without propogators)
I have a terrible problem with slugs in the garden, they ravage most things, hence i've tried using slate to make it all more of a chore to get to, and.... best of all i've just built a pond (which im stood next to here), which along with a couple of goldfish i've taken 30+ frogs of different sizes from my parents pond, along with a load of frog spawn - woe-betide any slug that decides to take up residence in this garden :-)