I'd been meaning to post a write-up on how to create a simple SpreadsheetML document from scratch, but just haven't had the time this week to pull it all together. Hopefully I'll get that out early next week. I had already done a similar post for WordprocessingML (both for Beta 1 as well as RTM). Here are a couple things I wanted to point out for the week:
I hope everyone has a great weekend.