iGoogle is actually a personal page (much like My Yahoo) - you may be thinking of Google Groups. I have a Google Group set up for our PTO board members to share files and ideas. It's wonderful. Here is a link to get you started.
Google Groups
Our teacher set up a PTO page on Wikispaces then turned it over to me since he didn't always have time to update. I LOVE IT!! It is so simple, which I really need and I have ours set up with multiple pages that parents can look through.
It is free for elementary schools and no ads. (I think the teacher requested that). Anyway, you can email from there, have a discussion board too. Although I have to admit I haven't used that yet.
I haven't used iGoogle for my PTC, but I have one that I use for my personal stuff. If you go to google.com there is a link right there to setup an iGoogle account. It's really easy, just fill in your info and then you're ready to cusomtize your page. You can even setup a google email address (gmail). My favorite tool on the iGoogle site is the customizable calendar and todo list. If you want others to see it though they would need the user name and password. I suppose if this is just for the executive board members then it shouldn't be an issue. Hope that helps you a little.
I read on an earlier thread that someone created an igoogle page to use for their pto? I am brand new to pto "stuff," but I am basically heading up the one at my kids' school now. I thought that seemed like a good idea to use for communication and email. I'm looking for something that is free that I could use to post announcements, updates, and use for pto emails. Any help that anyone could offer on getting organized would be greatly appreciated!!