Since I'm in a fixed schedule (K-5), I use Word in table format for my lesson plans. I put my collaboration form in Googledocs and am lovin' it. I relied on email in the past to collaborate, but had to move from it since too much email, and needed the interactivity.
Google Docs is always a good choice. You could always try Evernote (http://www.evernote.com/) or even a shared OneNote notebook if you have SharePoint installed. Zoho makes some good stuff as well.
Google Docs has actually been used by a lot of my co-workers. I haven't made the plunge yet but I just use Microsoft Word and print my weeks if I need to leave them for someone. I'm not 100% thrilled with my way, but so far it is working out. I can't wait to hear what others say. Lesson plan format is such a pain for me!
I am a complete amateur, but I have found GoogleDocs to work well. I save them all named with the date theme and standard numbers. I co-teach so it would work well for collaboration if my partner wanted to share them at some point. You probably have something fancier in mind, but this is working for me. Good luck!
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Just my thoughts....
Tony