I'm into this stuff way too much. It seems I buy something new every 3-4 months, on average, and never sell the old stuff.
Here's what I have, in the order that I got them:
- 512 Mb EFA-LINKER (ExtremeFlashAdvance) - A good cart, considering how old it is, and still a near-permanent fixture in my GB Micro.
- SuperCard SD - I don't care much for the build of it, but I have quite a few SD cards, and this is great for yoinking GBA/DS ROMs and save data. Some day I might spring for a SuperCard Mini, because I've heard it has the same build quality as the EFA-LINKER, combined with the functionality of the other SuperCards.
- Datel Max Media Launcher - Pretty much irrelevant now, but it was exciting when it came out, because it was the first really user-friendly PassMe solution.
- SuperCard Lite - Sucks. It's unbelievably hard to pull out and doesn't feel very durable.
- R4 (Old) - Excellent device.
- EZFlash 3-in-1 - It's good in terms of functionality, but there are better RAM expansion carts now.
- Ewin Expansion Pak - In terms of the hardware, this is awesome, but I'm hoping better software support comes along. I'm sure it will, as this is still new.
- R4 (New) - I bought this due to paranoia. I was worried about the spring mechanism failing on my old R4, but I figured I'd buy a CycloDS when that happened. But then CycloDS's factory got raided, so I freaked out and got a new spring-free R4 just in case they were next.
As for media, I have one good quality (and fast) Japanese 2GB Toshiba MicroSD and 3-4 cheap and/or old SD cards ranging from 128MB to 2GB. I also have a couple of Pro Memory Sticks (that I used in my OLD cellphone), a 512MB MicroSD (for my current cellphone), and an 8GB SDHC (for my digital camera).