I've been looking around for something like this. I'd previously bought a dayplanner binder on sale, threw out the dayplanner pages, dremel'ed off the binder rings, and pasted velcro all over. It worked, but I found a better solution.
I was looking at the dayplanners at Long's drugs. I found a leather dayplanner, but when I opened it up, it turned out not to be a dayplanner at all. It looked like a leather dayplanner on the outside, but on the inside, the right side had a pad, and the left side was covered with ... velcro!
I put velcro on the plastic cover that came with my Handspring, on the back of my cell phone, on my Stowaway, on the spare battery for my cell phone, and on a few other miscellaneous things like a couple of spare AAA batteries and the cable that connects my cell phone to my PDA for wireless access. It works like a charm. It is exactly what I wanted -- something that looks like a dayplanner from the outside, but is basically a cell phone and PDA gadget holder on the inside. I also have room for an E1, which I might stick on the velcro side. I can put a Spydercard in the sleeve behind the writing pad.
Unfortunately, I have no information on this product other than it is made by "Hazel". You might try the PDA case sites to see if there are better references.
Edit: Oops, in my rush to tell you about what I found that met my needs, I didn't look over yours closely enough -- you actually want the calendar. Sorry! Well, maybe this info will help someone else!
