I have a very large outdoor table, which I cover with chicken wire when all the seeds to be stratified are in place. The wire tightly holds down plastic trays of compost, the seeds themselves and a topping of vermiculite. I love watching it in freezing winds and rain, without my precious trays getting blown away, or one of my 11 cats getting at them.
The best successes I've had through stratification are the wild, or species roses. They come up all at once as soon as the weather conditions are right. I've done some trilliums this way too. Native deciduous trees are also very successful done this way (except the Oak, which I find needs to go in a warmer place to get started immediately before the winter gets going, and they seem to grow better under cover for the first winter too.
Check out Jackiegear on ebay for detailed growing instructions on her tree seeds. There are many sellers who give excellent stratification instructions, though they sometimes vary in their methods.
Used to sell some seeds pre-stratified, and they germinated very well indeed.