DCEmu (here) is a good place to download them. There's also other sites but I'd probably be frowned upon if I mentioned them here (particularly one of them).
So, to do what you want (use an IR Keyboard for emailing on Gmail on your PSP), you'll need to downgrade with the 3.50 downgrader that zx-81 showed you (I'm not sure if you've already done this). Then upgrade to 3.40 OE-A (or I might suggest 3.51 M33 because that is actually the latest firmware and it's hacked to have homebrew support, so if you want to be on the latest Sony firmware and have the latest Sony features like you mentioned, 3.51 M33 might be for you). Then install zx-81's mod of PSPoste which is v6.1 (I don't know if it's on the PSPoste website since zx-81 is the one who added the IR keyboard support). Then lastly get an IR keyboard if you don't already have one (the reccomended one is the Targus Universal Wireless IR Keyboard). Once you've done all that, then you should be able to email away with a keyboard on your PSP using Gmail
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