For installations over slower connections, or other such reasons, it is desirable to install a package or two at a time. To make this reasonable, up2date should allow using the already loaded package list and installing another round of pacakges...
speed enhancements and caching are in the works.
Assigned QA to jturner
rawhide up2date caches this information. A new stable release will be forthcoming in a few weeks or so.