I returned the Dell aluminum case today. I was told by Dell that it would accomodate the larger battery - it won't. I didn't like the case door being on the right - I liked the flip case I had with my iPaq, but alas, it won't fit the Axim. Also, the top of the Axim is not covered by the aluminum case. When a CF card is inserted, there is a large gap left behind the card. Since I would be carrying my Axim in a handbag, I'm concerned that little goobs and fuzz would get into that space and eventually that could foul the contacts and damage the CF port.
I also returned the large battery. Frankly, the battery that comes with it is truly AMAZING compared to the life of the battery in my old iPaq. The large battery adds more weight and bulk to the unit than I'm comfortable with. I read a post somwhere here tonight that the Axim is too big and bulky; compared to my 3-yr-old iPaq the x5 is a sleek, sexy little sports car!
I researched cases and bought the Rhino Skin flip case with belt attachment for my husband - he's very happy with it and the case is slim and reasonably well made for what we paid for it, although certainly not 'deluxe'.
I checked out the Grinder Gear bags - they're very cool, but I wrote to them requesting 'more chick colors'.

Amazingly, they wrote back today and said they'd consider that for their next production run. I hope they do.
I found a RED leather flip case - it is supposed to arrive tomorrow. I have my fingers crossed that it is nice...I'll let you know!