international phone rate, international calling card, long distance phone rates

I-Link/WXC offers the lowest international phone rates of any long distance carrier:

4¢ All 50 States, In State, Guam, Virgin Islands, Puerto Rico
5¢ Canada, North Mariana Islands (Saipan)
6¢ Singapore, Germany
7¢ Hong Kong, Ireland, New Zealand, Norway, Sweden, Switzerland, United Kingdom 

No monthly carrier fee.  Available as dial 1 or 10 10 XXX service.

WorldxChange/I-Link offer the best 5 cents a minute plan with super low instate and global calling - no minimums.

5¢ All 50 States, Guam, Puerto Rico, Canada
7¢ Intrastate, Singapore
8¢ Hong Kong, New Zealand, Sweden, UK
9¢ France, Germany, Ireland, Norway
10¢ Italy, Japan, Netherlands

No minimums  Monthly service fee of $3.95 for dial 1service.  $4.95 for 10 10 service. 

Noble.com has the absolute cheapest phone cards for both US state to state and worldwide calling.  They have several cards to choose from the cheapest being their 1.5¢ card with international rates as low as 2¢.  Surcharges per call apply.

Cogni-Talk has a great card with no per call  surcharges with the exception of payphones.  Great rates worldwide. Quantity discounts available. Email PINs only - same day delivery!

Roadtel works FROM over 30 countries worldwide featuring low international and interstate rates. Billed monthly, the regular cost of interstate service is 8.5¢ per minute, billed in full minute increments. There is no per-call surcharge with the exception of payphone calls.