I just started doing this myself with my analog cassette recordings. I used to use a marantz pmd 430 and find patches from friendly tapers with mics =D. I am using a decent quality cassette deck(I have like 600 dead shows from trading back in the day) into my pmd660. I will upload some of the flacs when I have finished. It really brings back memories listening to the shows as I re record them. I have masters of dead, merle saunders, rusted root, dylan, hot tuna, allmans, and others.
I recorded some of these a few years ago using my line in on a PC and music match for recording the wavs, but I never really liked the results, probably due to a cheap soundcard, and/or motherboard hum. I find I am getting much better results going to my pmd 600 directly and then editing the wavs on my PC after.