I'm testing Eagle 6.2 freware after about 6 years (I used any 4.x version before) and still missing the same thing. Search.
When I open my window with libraries, projects, cam, etc., here should be fulltext search textfield which will filter project, or library which contain entered text it its name or description.
In the schema or board editor, when I use Add function, is some search field, but it doesn't work. For example I enter 1N4148 and nothing! I must enter something like 1N414* and now it work. Why? 1N4147 exist in the library. This is bug, I think.