It's been a busy semester for me, hopefully I can get back to doing more frequent updates again before too long. 

I updated the code package for the 18F4550 USB Interface article, nothing significant, just added the precompiled HEX to the demo firmware section - I think I must have hit "Clean" in the project options in MPLAB when I put the code package together previously, which removes all unnecessary project files, including the HEX.

I've been working on interfacing an SD memory card on the 18F2550, bit-banging the SPI interface.  So far I've been able to initialize the card, so hopefully it won't be too long before I have it fully operational, and then I'll try to put together an article on it.