Saw a neat article posted over on WOS, written by a guy calling himself Philip Mulrane. It's certainly one for the hardware hackers amongst you, and I know there are a load of you. The title is "I can't believe it's not the +D!" and it's some details on building your own +D interface. At one point this was the system all ZX-users needed, especially for swaps in the demoscene (until the MB02 came along). But as mentioned in the article, they're generally only available now on Ebay at huge prices. Well now you can get out your soldering iron and have a crack at creating one.
I've not checked out the full article... far to techie for me. Could be good for some of you, tho'.