I have been a long time user of PostEver. While I have know about WriteNote for a few months, I did not know until yesterday that WriteNotePro allows you to select between up to six different Notebooks to post notes to. With timestamps and the ability to post in chronological or reverse-chronological order within a single post, it is one of the best brainstorming application I've found in Goole Play. Update: The developer is very responsive. I mentioned that Auto-capitalization is not working and he send me a new version he's developing that has it. I suspect this updated version will soon be available on Google Play.
WriteNote Pro at Google Play market analyse