There are a lot out there. Hal Higdon, Jeff Galloway... look at getting on a 1/2 marathon team as well.
I did the Jeff Galloway last year and while I was running faster than I was supposed to, it was just a very easy pace for me, I found I couldn't do his mileage increases w/o having compression issues in my knees after I hit 8 miles.
Which, like you, never thought I would ever do! I had to do the C25K three times before I finished it!
Anyhow...I would find a 1/2 program that works for you and just start it. You can back it up after you have gotten so far to stay within your race date too.
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