Homemade Serial Receiver
If you can solder and can figure out what shops sell transistors then you can make your own serial receiver. There is even a list of Homebrew lirc reciever parts
And what you'll be building is something like this:
And if you squish it down it can look like this:
and if you have a one of the Hauppage PVRs you could use that (they look a lot neater!) :
One advantage of building it like this (with the 1.5mm stereo plug/jack) is that you have the ability to route the actual IR receiver anywhere (even another room - though I don't know what the maximum distance would be).
oh, if you want your 1.5mm jack plug to be compatible with the Hauppauge:
Base = GND Ring = signal Tip = VCC+
Someone on the (MythTV-Users) mail list claims 281 Ft using CAT5 and Hauppage IR sensor.