I am looking for tight growing (less than 2 inch tall) ground cover plants as Lawn substitute. I live in SF Bay Area (USDA zone: 10, Sunset zone: 17). Full sun (after noon sun, 8 hours). I am considering Leptinella squalida (Platt's Black), Dichondra Repens as well as Elfin Thyme.
Check out a company called Pro Time Lawn Seed out of Portland, OR. They do all sorts of interesting mixes. Last year I replaced a 500sq ft parking strip up here in Seattle with the Fleur de Lawn. We let it get fairly tall (maybe 8"). It was beautiful, but did better when I kept it shorter. Mowed it to 1" for the winter (probably not the best idea) and it looked a little bare. We're now looking forward to the growing season as the first lawn daisies are blooming. I'm planning on keeping our meadow around 2" this year.
On a side note, part of the reason we switched away from lawn was because of high number of dogs using it as a toilet. Interestingly, the dogs (or perhaps the owners) don't see the meadow as a toilet as long as it's mowed higher than about 1/2".
Another website to check out is Stepables. You can get most of there products at your local garden store often not by the same grower. However, if you have a large area to cover, I believe they sell trays of 2" plugs online during the growing season. You might also investigate getting a wholesale licence if you have a lot of plants to buy.
One last note, you could try starting stuff from seed, but it might be a couple of years before you see good results. If you're going to plant starts pay attention to both your layout (square vs triangular) and your spacing. Check out a plant calculator to play with numbers. Use a 1000 sq ft area as an example - square spacing at 14" needed 735 plants, but square spacing at 7" needed 2939. There are probably labor calculators out there, but I don't know of any off the top of my head. I can look it up if you want when I get to the office.