I understand that GEOHOT is releasing modified V3.21 firmware which retains our beloved OtherOS support.
In addition, there is a MAGIC IP, which when configured in your PS3 as the DNS or as a proxy will bypass the 3.21 Check and allow your console to continue gaming / using the PSN network.
Furthermore, you can now install a special PS3 proxy on a windows PC, and configure your PS3's proxy settings to use the proxy, which will allow you to bypass the check.
At any rate, I'm retaining my 3.15 firmware, and my otheros support, until I see how this all pans out.
Lastly, everyone needs to contact their local consumer protection organisation, and alert them to this disgraceful situation. If Sony gets away with this rediculous "feature removal", it won't be long until other corporations learn of this neat little trick, and follow suit.
For the next trick, they'll start revoking product features, and charge for upgrades to get back the original features!!!