I've been on Ancestry.com for 12 months, and have about 500 names in my tree.
I've got back to the 1760's in Edinburgh, and traced the movement of family members down to Manchester. An ancestor was a steam engine manufacturer, and my father & grandfather had an engineering business. (I've let the tradition down by becoming a Chartered Accountant!)
I've found a branch of the family who were in the Army in India, and am working on another branch who were probably employed at Chatsworth.
I'm doing research for several friends too - it's an absorbing business!