I am currently an ING USA customer, but came across Captial One's 4% high yield savings account when paying my credit card (used for foreign transactions) with no foreign currency fee. Looks like Capital One slightly beats the ING rate.
Some info:
No fees to open or maintain your account
No minimum balance
Links to your existing checking account
FDIC insured for up to $100,000 per depositor
Convenient online account access
http://www.capitalone.com/savings/hy...h5o4A5SLdaMxOu