I went out to check the garden yesterday and the first of the radishes are now ready! The ones above are French breakfast radishes "Petit Dejeuner" from Renee's Garden and are delicious right out of the garden. Sweet and slightly spicy, I'm going to try them out in a radish and cucumber salad. Be sure to thin them out per the packages directions or else they won't reach full maturity.
I'm finding that seeds from Renee's Garden are very easy to find (I bought mine at Osh) and she has an informative website where you can order a wider variety of vegetables if you can't find them at the store.