I do try to use and embrace Research Manager and Logs for such ongoing notes and scribbles although there are currently limitations. I have noted with interest an indication of some improvements in Version 8 where To-Do items and Research logs look to be combined and this may make these features more useful in the future.
Outside of the lack of compatibility with other programs the current limitations are that Research Logs can only apply to General, Person, Family, Event or Place so apart from Family (husband and wife) they are singular items. It should also be noted that a Research Log attached to an Event which is Shared does not show on the Sharee.
Personally in a case such as yours I would use the Misc fact with Search for the travels of Bob & Joe and Share the fact with Bob & Joe or anyone else it may pertain to. I use very few Custom Facts except as research keys to help progress and not for sharing outside my own desktop but one I do use is Research Notes with the Description field enabled. The Description field on People View informs me in brief what I know of where I am stuck and I update the Notes with what I discover on an ongoing basis. I can Share this fact with other people if appropriate and usually file the complete research process from Notes to a Research Log when completed.
There are many different ways to achieve such things, an important factor to me is visibility of the information until resolved and having it at my finger tips, the link below is the Rootsmagic video on Research Manager, it may or may not suit your needs.