I had the unexpected opportunity to purchase my Touch and went for it (knowing new ones were coming - i'll upgrade to something bigger when some money is repaid to me).
So to update where I sit as my Touch being my Palm/Treo replacement.
Calendar - i have been using DateBk on my Palm since the get go, um, 8 years ago? (when the first Sony Clie was out). The build in Cal was NOT working for my scheduling needs, Pocket Informant does all i need - and i'm even starting to use the ToDo in it. Worth the $12. I'm syncing to Google with the free CalGoo program, so my desktop is in sync and my Treo would be if i'd sync it. The automated sync over wi-fi with PI to google is nice in that regard. I've mostly dropped using the cal on the Treo (and if i did it would be trouble because i have a ton scheduled that are not on there at this point. UGH.)
Medical Tracking - i have yet to find a single app that works in this area. I have however found 2 that work for me, illness tracker and Growing Up. I can keep appt notes in illness tracker, and the height/weight stuff in Growing up. Growing Up is a nice clean interface and does this task well without making me think i'm using a "baby tracking" type of software (my DD has a growth disorder and tracking height is huge for us). I was attempting to use Health File on the Treo - it stunk in the height tracking area, but i could keep the rest of the stuff together easier. Appointments could be scheduled in it and put on the Calendar.... obviously this is an Apple "problem", but there also seems to be a lack of "doctor appointment summary" type of App's for the Touch. If anyone knows of one let me know!
Gas & Mileage Tracking - I had been using MPG by Catamount on my Treo in the past. It wasn't on there right now for some reason. I was going to buy it for the Touch - but figured i'd look at the rest of the apps out there. I settled on Gas Cubby and Trip Cubby. I really really like these apps - heck, i've tracked 2,775 miles related to medical visits since mid-June (hence, the need for the appointment stuff up above). I also will be averaging 150mi/wk for OT & ST therapies for one child and am in the process of a divorce - i need to track the mileage.
Handyshopper - is still not duplicated. Splash Shopper has some mega issues (they are responsive to them on their forums), but since i'm still using the Treo - i'm sticking with Handyshopper. I'm going to have to work on my SS list and see if the latest version fixes a few things and attempts to make it useable.
Contacts and Mail mirror what i have on my desktop, i've had to use the mail at a meeting even to check dates. It's been nice.
I haven't easily replaced another app i'm using - it creates date/time entries on my calendar. I'm still using the Treo for that, Handyshopper and phone calls (and SMS). But that is about all - everything else has been moved over. The biggest issue i run into is battery life and not having it on my hip like my phone. The kids realize that it isn't ALL for fun and accept that i need it working for me. I try to make sure it's charged for one of them to play in the waiting room of our various appointments though.
I'm not wanting to buy a case for it to reside next to my Treo right now, but i'm going to have to do something soon if i'm going to rely on it for the "portable brain" features. I just haven't found one i like.....
ANYWAY, i have other apps that i'm using daily - but i wasn't using that kind of app on the Treo right now. I'm trying to integrate more stuff so it does become more of my "portable brain", so i'm always on the prowl. I'm pondering the Notebooks app.... but i need more storage space. 8gb ain't big enough! LOL!!
So there i am for now....