Any Tennessee researchers out there?

I've just started poking around at a branch of my in-laws' family and the search quickly took me to Tennessee, a state I have never been in let alone done any research on. Fortunately the family was from Knox Co and that seems to be a good county to work with. Right off the bat I found a site for the Knox Co Archives at http://knoxrooms.sirsi.net/rooms/portal/page/21590_Knox_County_Archives
which has a good running list of popularly requested holdings as well as an online Marriage Index. The staff was very helpful and even helped me understand what it was I was looking for and what information would be provided after I sent an email inquiry. Beyond having a helpful staff though, the charge for photocopies and shipping of marriage records is very reasonable ($3.80 uncertified/$6.80 certified for marriage records) and the turnaround time was quite timely. Although I still have a ton to learn about genealogy in Tennessee, my first experience with records from the Knox Co Archives was definitely a good one.