We have been asked a few times about suggesting a really simple interactive whiteboard to accompany our conference calls in progress.  After a quick review, Dabblerboard seems to be a viable solution to share a drawing or mark-up a picture.  One of the features that stand out, is that you can easliy embed your whiteboard in your own blog or webpage.  Also, they have alot of pre-defined shapes that you can copy into your own account.  

If you know of other interactive white board solutions that are worthy of noting, please share your comments.