I am on v39 of the firmware, which is still greater than the v35 that is STILL on their website. Not sure why they haven't released a newer version for the general population.
As for the HTPC getting a bit old, it is actually the most powerful computer I have in the house (which is saying quite a bit). I spent a good chunk of money on it. My 3 most powerful computers, in order, in the house are: #1 - HTPC #2 - Media Server (way overpowered for what it does) #3 - My primary desktop where I do photo and some video editing