SSDs on that interface are mostly for netbooks. If it's a standard implementation of miniPCIe, it may work for laptops as well, as long as the BIOS doesn't whitelist anything. A lot of the older laptops I know of whitelist specific wireless cards that go in the older miniPCI slot. The miniPCIe interface is capable of 250/500/1 GB per second so it could be a great alternative to SATA. Too bad nearly all laptops only have one slot which is almost always in use by the internal wireless. 🙁
ExpressCard is another alternative as it maxes out at ~250 GB... almost SATA II speed.
Your question isn't pointless. Your post about it actually reminded me about these SSD on miniPCI as an option of an older PATA based laptops that are still being used in my family.