I think that's ruddy useful of them to make that available.
Only partially useful in the case of shareware, since for any apps that are no longer available on the current software market (in any version), you probably wouldn't be able to purchase a license to keep using it. And in some cases for software that phones home as part of the installing process, you can't even install it to get the free 30 day trial. I know this from experience, since have a folder containing about 5G of setup files, downloaded directly from Tucows, back in 1999, a gift from my father, included on a computer that he gave me in 2000 (I still don't even know what most of them do!)
