For USAirways:
The international upgrades are now as follows:
30,000 from USA to Europe
40,000 from USA to Middle East (PHL-TLV service starts Jul-09)
RT tickets must have a total value of $1400 to qualify for point upgrade.
O/W tickets must have a total value of $700 to qualify for point upgrade.
Also, points expire after 1 year of no activity in a USAirways account.