[wofser]

What would be really cool is to make reminders that reminds you when you are in a special area.

For example:

When I am close to a special shop it reminds me to get that special battery that only them have.

When I get home it reminds me to do something in my home, take out the trash for example.

When I visit a friend I get a reminder about something I should inform him of.

Location-based notifiers instead of time-based (or a combination so it would not remind me to go to the store nearby in the middle of the night and its closed).

[raimondious]

Location-based reminders are already implemented!

[sharkman]

it's in iPhone 4S, but it drains your battery like crazy

[jaxn]

Why do you say it drains your battery like crazy? I am not saying it doesn't, but I haven't noticed it.

Doesn't iOS now have a location service that will update apps of your location without running the app constantly in the background?

[ja2ke]

Location based reminders are a feature in iOS 5 across all phones. My vanilla 4 can do it, so presumably my old (and iOS 5 supported) 3GS can too.

Siri itself is the only (big?) iOS 5 feature that is hardware locked to the 4S.