Lith printing - a Google search will produce a lot of good information, actually. The best resource for learning lith printing is the book by Tim Rudman. Search for 'The World of Lith Printing'.
Basically, you use a highly dilute lith film developer, and you control contrast by exposure time, but methods with flashing are also great. Some people use their contrast filters and triple the time they used for a good normal print. I like to not use any filters and I start at 40 seconds at f/8 with a normal neg for an 8x10 print and I work from there. Graded paper and variable contrast papers both work, but not all papers in those categories will work.
There is a lot to know about the subject. The results can be very eyecatching, and it's the technique I prefer, even over regular black&white printing.
- Thomas