Well, I finally got past level 16. The answer was in fact one I'd already tried, but it didn't work because I foolishly omitted the semicolon. I am so not a programmer. The amount of hair I tore out on that one... 
After that the other puzzles weren't too bad, right up to number 30. I'm stumped. I'm sure the solution is probably relatively simple, but I've been staring at it on and off for hours and nothing's jumping out at me. Is the email address 100 characters long? Do I need the first two hundred digits of Pi? Am I barking up entirely the wrong tree? 
EDIT:
No, don't answer that, I think I just figured it out lol 
Excellent, I just got my confirmation email from Jeff. I win! Well, nearly, there were a few people before me. I'll have to wait until he updates the main page to see what position I finished in.
#22 (C# IceCream code) was evil wasn't it? I typed the correct answer in but I wasn't paying attention so I didn't see the link appear above the code image. I must have checked and re-checked the code a gazillion times before I noticed it 
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