Power Station offers charging, hot spot, secure storage, and rentable chargers: Power Station's press release says the company is building 211 kiosks intended for airport and similar deployment. The kiosks offer Wi-Fi service (802.11g, even), but they also offer power in three ways. First, you can plug in at the kiosk to charge while using the hot spot service. Second, you can store your laptop and/or cell phone in a secure locker. Third, they rent external batteries that can recharge your laptop while you're using it.
The company offers something they call a WebPad, which sounds like a portable Ethernet-to-Wi-Fi bridge so that customers without a Wi-Fi card can still access the hot spot. This obviates one barrier to getting people to try hot spot service.