Question : Will the source for blogmarks.net be made available? Sites like del.icio.us say no because they want to foster a community but there are domain specific communities that could use something like this

Answer : We plane to release blogmarks.net source code but it's not ready and we've not decided the license yet. At the moment we think we'll go with a "non commercial use" license but maybe some parts will be released under GPL or LGPL.