I use a calling card when in the US. Many of them give you 5c / min even when calling back to the UK, then use my ISPs (pipex) "international calling" number....
Even dialing internally in the states, its often cheaper to use a calling card than use a hotel phone with "free" local calls. Normally they bung on a 50c charge per local call, and if you only want to check your email, then its just as cheap to use a calling card (especially when you get kicked off after 10 mins and have to reconnect).....
The other way I do it is borrow my Brother in law's AOL account, set up a new screen name, and use the AOL local access number....
EA