Possible topics:

1. Spelling instruction within the context of writing (I hate how I give spelling worksheets and tests every week!)
2. Revision strategies, particularly with Google Docs

I use a revision circle where one child is the reader, one is the summarizer, one is the praiser, one is the suggestor and one is the questioner. You could do that on google docs, where you assign each kids a task for each paper and the kids write comments to that student- Annette