You can do this via the search function but the plus here is that you get single results (ex. if you are looking up product id #99 you get only 99 back rather than 999, 1999, 2999 etc) and you don't need to wait for the frame to reload before starting your next search.
I use it to quickly find out what category a product is assigned to and to find orphan product id #'s so that they can be reused. Customers could use it to reorder simply and quickly if they have the product id from past orders for the items they want.
Top 4 Download periodically updates information of Product Info Lookup script from the developer, but some information may be slightly out-of-date.
Our script download links are directly from our mirrors or publisher's website. Product Info Lookup torrent files or shared files from free file sharing and free upload services, including Rapidshare, MegaUpload, YouSendIt, MailBigFile, DropSend, HellShare, HotFile, FileServe, MediaMax, zUpload, MyOtherDrive, SendSpace, DepositFiles, Letitbit, LeapFile, DivShare or MediaFire, are not allowed!