I thought this might be useful for some people as it has been requested before.
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[*]Add BOT2K3 (maven@bot2k3.com)
[*]Open a conversation and write !addnote
[*]Draw your image and send it
[*]Type !exit to finish saving
[*]Type !notes to view your notepad
[*]"To view a note, type "!shownote <id>". To remove one, type "!removenote <id>". If you want to add a note, type "!addnote" and just type, draw, or speak (hold F2 while speaking)."
[*]To paste your ink message into a conversation, open one up with a contact and drag your ink message from the BOT2K3 window to your contacts handwriting box
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You can only save up to 500 KBs and I don't know how reliable it is, but it may come in handy