I'm typically a 20% tipper for good service, but I've been known to go up to 40-50% for outstanding service that just really blows me away (which I will admit is a tough thing to do!). For bad service, my server will still be tipped, although in the 10-15% range...I don't know that I've ever left less than that, but I do want to make a statement that the service wasn't up to my expectations.
As far as other services...pizza delivery gets 15% normally from me, take out restaurants (like the Chinese walk up place I like to frequent that know my order the minute I hit the door) get normally $2 so around 20%, and my hairstylist gets a nice bit at 30% since he always goes out of his way for me and does a fantastic job. I'm trying to think if there's anybody else that I tip on a regular basis, but I honestly think that's it.
ETA: AJ, we have 2 separate minimum wages, one for servers and one for regular service employees. I'm not sure how it's worded, but there's 2 totally separate ones. Bartenders tend to make somewhere in the middle of these 2 as well, they are normally paid more than servers from what I understand, but still not quite the regular minimum wage. My server friends make $2.01/hour my bartender friend makes around $4.00/hour and regular minimum wage is (omgosh I'm sorry I don't even know for sure but..) around $5.15/hour.