Apple has sold over 150 million songs through its iTunes Music Store, the company announced last night.

iTunes users are now downloading more than 4 million songs per week, a rate of over 200 million songs per year. Apple also announced the immediate availability of iTunes gift cards at all Best Buy stores.

Such gift cards are also available at Target stores, Apple retail stores and online through iTunes.

Napster yesterday announced pre-paid Napster cards, to be distributed through Dixon's stores in the UK.

The 150 millionth song was "Ex-Factor" by Lauryn Hill and was purchased by Beth Santisteven from Ignacio, Colorado.