If you want to charge any sized lithiums:
http://www.dealextreme.com/details.dx/sku.6105
Just use a spacer for other sizes. You can make your own using a thick speaker cable. (that's what I do)
It has 2 separate fast 1A charging channels so it charges RCR's quite fast. It's also quite accurate.
You shouldn't be doing it at all, and it is extremely irresponsible of you to be implicitly recommending this practice to other people.I don't do that all the time.