http://www.i-am-bored.com/bored_link.cfm?link_id=17727 I got stuck for a minute, then went back and read the instructions where it says that connections can't be diagonal. And here's another tip, you can't just go the direct route with a lot of the connections. You might have to go around or double-back on some puzzles.
I was about to give up when I got 16. Stuck on 17 now. The weird thing is that although it took me a long time to get it, there wasn't really any satisfaction when I was done. Thinking about giving up on 17 now.
I just finished level 29 and I think I'll take a break. I took screen caps of all my solutions, too. So if any of you are stumped, I can help.