Plastic Jugs : Learn all about winter sowing with plastic milk or water jugs (they act as mini-greenhouses).
Biodegradable : Save up your empty toilet paper rolls and transform them into biodegradable pots with a few clever snips and folds.
Soil Blocks : Produces a growing medium that does not use a container and is easily transplanted in the garden.
Also check out 10 Seed-Starting Tips  from Fine Gardening, the article is a great reference that contains tips and plenty of resources, including:
- Keep records to allow for better planning
- Store seeds properly to maintain viability
- Cover trays with plastic wrap to keep the moisture level constant
- Keep them warm to encourage germination