Still pondering the question shall I upgrade to Lion, or not? David Passell shares this information from MacLife. The writer ventures between serious and humorous, and the comments are sensible. I found the best advice from someone named Fabulo writing under Comments who advises to partition your hard drive and install Snow Leopard on one partition and upgrade to Lion on the other partition. You can continue to work with a familiar system while learning the new OS at a comfortable pace.