Very good suggestions from Dermit but personally I don't like the idea of assigning keywords at this stage; especially since its very easy to apply keyword tags from the Library Mode. You can use the keyword sets, the Painter, and even drag-and drop thumnails over keywords in the Keyword Browser to add them to your photos. Unless the assigned keywords are common to ALL the images being imported its not the optimal strategy in my opinion.
Instead, what I do at the import stage is to assign bulk metadata that will be shared with all images. Items like my name, address, contact info, website address and, most importantly, copyright status. I have a saved Metadata Preset called "Common Metadata" which as the name implies contains metadata entries that are common to all my photos.
After importing, I go to the Library Mode and in Grid View I work from the general to the specific. That is, I select all the newly imported photos (CTRL+A) and add keywords that are applicable to all the photos (e.g. if they were all shot at the same event or same location). Then if the photos contain unique elements I want to specifically identify, I go back to the beginning, enable the Auto-Advance function, select the first thumbnail and add those unique keywords (Names of people in a photo, for example). The neat thing is that keywords appear in the Keyword Browser panel (left side of Library Mode) so its easy to select a group of thumbnails that have common elements and drag-and-drop them on to the keyword(s) you want to apply.
please log in to view hosted photos in full size.