Oddly, to me, the full PuTTY suite is way easier to use then all the ssh stuff on Linux. PuTTYgen/Pageant makes ssh private keys just work, PuTTYgen also has the handy "open a private key, here's your public key for it" text box, that makes everything dirt obvious (of course you can export the public key as well.) And the other major SSH-based software I use (WinSCP) integrates with Pageant as well. I know all this stuff would be equally simple with Linux, but on Linux, there seems to be "use a single key" thing, whereas I prefer to have multiple keys for personal and work use, which Pageant makes trivial.