Well I don't use tethering all that often, only if I'm in a place without wifi, but its definitely a nice feature to have. And most of the time instead of using my laptop for internet, I find myself just using my Droid anyway.
i use it often but not quite as often when im at work. since im block from downloading roms . i turn it on and i just go go go. LOL also use it at places like starbucks when i need to do presentation that requires internet demonstration of stuff or retrieve files. comes in handy if anything.
I use it at work, 10 hours a day, it will occasionally go offline, but I think this is just because the signal in the building is not always that strong. Two clicks on the laptop and it's back online, never a problem.
I am on hour 1 of a 7 hour trip home from Universal/MGM and I'm tethering right now...
it's also my home internet.... I don't use it for WoW or anything, but I also didn't use my $50/month home internet for that. So why pay $50 more a month for the same thing I get for free from the droid?
I use tether for internet access when in airports that charge for WiFi and then usually for less than an hour at a time. There is no WiFi or high-speed internet access at my mother's house so when I visit her (a few days at a time), I tether three or 4 times a day for about 1/2 hour at a time.
Once in a blue moon, I will disconnect the laptop from the company network and tether for a few minutes to handle some personal email access.
I'll tell you guys what. When I first got PDANet I used it a lot at work (they are funny about us using company computers for personal use, but they don't care at all if you bring in your own device). After the novelty wore off, I really only use it when I have to do something on the internet that requires a PC. The Droid is so awesome that I can do 95% of the things I want to do on the phone itself.
If the keyboard was like a BB keyboard, I don't know that I'd really tether at all. The only time I really need the PC is when I'm typing out a long email or message board post. My hand cramps up on those on the Droid.