True, I may be still in a Windows frame of mind. My previous experience with Macs involves using them in school (hence, I never dealt with hooking up peripherals). I bought my first Mac with Panther, which I am still running. I am waiting for Leopard to be released when I will buy my second Mac (along with several family members I have converted to the fold). However, I am a little nervous about it as I am afraid that some of my peripherals will no longer work.
The main device that I am thinking about is my expensive HP scanner (which recently died anyway), for which I had to buy a $20.00 CD from HP to get to function with Panther. Admittedly, this is the only device that I can recall having to buy any driver/software to make it function. Dialoging with HP at the time I was informed that buying this CD was the only way to make the scanner work. They also informed me that the scanner would not work with Tiger.
I had a 5 year old printer that I got working with the gimp (?) drivers included in Panther (if I am describing that correctly).
Everything else I own (cameras, scanners, printers, and hard drives) are all less than 3 years old and caused me no problems upon installation. But let’s see: my external drives plugged in and worked, like you say. My Samsung Laser came with drivers that I had to aim into the Library under Printers. I don’t think I installed anything for my Canon cameras other than than viewer utilitiy that I use with the cameras-if for some reason it stops working, I can easily use some other viewer. My expensive Canon scanner I just bought involved installing a TWAIN driver from the CD. And my big Canon photo printer has elaborate quality, media, and colour options specific to it installed, so it too must have came with a driver.
Whether all these will work as they should under Leopard, I don’t know. As I said several family members and a friend are going to buy Macs with me when Leopard is released. They are going to be looking to me to get their computers working. Perhaps you can relate to me more specifically your past experience with previous versions of OS X and older perpherials that you owned? How you got them to work without losing any functions?