Hi Bert, I'd be interested to see what people have to say - I'm looking for something exactly similar to this as well.
I've been getting along in the meantime using mediawiki
. I use the wiki simply like a notepad and jot down information following meetings; client details, project plans, relationships etc. The great benefit of mediawiki is being able to put each page into categories and using the 'what links here' functions to let me cross reference clients with other companies etc. It's only a stop-gap measure, just slightly better than writing the information down, but it's keeping me working until I find something like the application you're looking for.