I did it. I hired a summer nanny. It was actually pretty simple: scour craigslist for part-time sitter, e-mail to set-up interview and request references, check references, extend offer. Done! She seems like a lovely girl - she's only a high-schooler - and I am delighted to have someone to keep the children occupied while I work.
For awhile now, I've had (slight) working mother guilt pangs because whenever Olie wants to do a craft project or play a game or go to the pool, I shoo her away with a gentle (or sometimes not so gentle), not right now. I see the disappointment in her little face and I know its unfair of me. She's only six, it's 90+ degrees here and dammit she wants to go to the pool! All perfectly normal six year old behaviors but mommy has to - wants to - work.
I was really motivated to Find a Summer Nanny because of the the great comments from PT-LawMom and the inspiring working mother stories from Mommy Wars - in particular the bits about how much WAHMs valued their nanny - convinced me to Just Do It. So, I did. And she starts Friday, then three days per week after that for the remainder of the summer.