What are the existing apps or UIs for managing wallets that take advantage of AA and exist today?
Clave is an example that has one-click onboarding via PassKeys: https://twitter.com/getclave/status/1750216152435888560
SyncSwap actually takes advantage of AA as well! They allow you to pay gas using tokens such as USDC and WBTC.
We provide a modular paymaster API which accepts any token as gas :)