Thanks to everyone who responded to my question regarding getting my butt kicked by the "Minute Walkers".
After reading your comments and looking into the Galloway method, I decided to give it a try. I don't think I'll do the 1:1... that's a little manic for me. I'm going to try a 2:1 (2 minute running: 1 minute walking) and see how that works for me.
I have a few reasons for wanting to try this. First, my knee has been bothering me since my 10-mile run two Saturdays ago. Second, we have a 12-miler coming up this Saturday and I am very nervous about trying to run this. Finally, I'm ready to try something new, with the hope that it will be better for my body and maybe even make my time better.
The main obstacle I have to get over is me. I have it in my mind that I'm somehow cheating or letting myself down by walking (on purpose). Intellectually, I know there is no shame in walking but it's harder to convince my pride of that.
I'll try it out this week and let you all know how it works out.
Thanks, again, for all your input!