Create a way, in which users can create sub-sets of the data they own, without having to set values in the allotted fields or find some complex filters for a view or report. The analogy is taking the files for your current key customers and putting them in your bag, or copying your current documents to a temporary folder. This is different from listing the records recently viewed/modified, which we have now (and is very useful, but for a different purpose).
I have in mind the ability to flag (for example,a button on the header saying "Briefcase") or maybe to drag the header bar to an icon on the left hand panel for the Briefcase, or an additional option on a view, besides the edit and del buttons. Then, by clicking on the icon on the left hand panel, the user could pull up just the records they want to work on.
I would suggest that this might include the obvious Accounts, Leads, Contacts, Opportunities, and maybe, Cases, but, ideally, should also contain the custom objects too. There would need to be a means of getting these records out of the Briefcase too.
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(User Experience)