I use the funnel all the time too. It's the perfect size to fit over my Kyocera CM-45 CF grinder when I'm pouring in beans. I put the funnel on the top and tare the grinder+funnel on the scale and pour in 18 grams for the Twist.
I also use it to fill my canning jars with greens and roasted beans. Well, the Aeropress funnel as well as a regular canning jar funnel, whichever is handy. It even fits over a small tightvac container that I'll sometimes use to store 18 grams of whole coffee beans to make loading easier.
I'm using the Aeropress a lot more now that I've got the Able Brewing 008 sized Disk. Just used it this weekend to make impromptu iced coffee from the last of my Ethiopia DP Jimma -Nigusie Lemma batch. I didn't bring much coffee and gear to my folks, but I did bring the AeroPress and a bit of coffee and I'm glad I did. Use it at work too when I want a full cup of coffee or a coffee that doesn't favor espresso instead of the Twist.
I was just thinking today that there should be a iced coffee Aeropress with an ice chamber below the coffee chamber to make single-serve iced coffee easier. More of a solution in search of a problem since you can just put the ice in your cup and brew into that, but it would look interesting for sure.
Here's my as-yet untried single-serve iced coffee recipe that I scaled down from my normal Chemex sized batches:
Single-Serve Iced Aeropress (beta)- 14 g coffee (~ 1 AeroPress Scoop)
- 100 ml water
- 70 g ice (~3 ice cubes) washed
Update: The iced Aeropress of Handsome Coffee Roaster's Lourdes de Naranjo Costa Rica turned out pretty nice, but I might consider scaling up the recipe as it made a fairly small cup.