I have a lot of seeds for the variety Russian Mini Yellow (It's not black) It is Indet. that prolifically produced little tiny white/yellow tomatoes that are less than a half-inch wide/tall. They are very sweet, and you need to pick them daily. Karen, if you would like some seeds - send me a PM.
Other than growing them myself, the only other info I have about them is from post #16 on this thread
http://www.tomatoville.com/showthread.php?p=329357