Application is available in English, German, Chinese (thx Yujie) and French (thx Vincent).
MultiSim tracks all sim cards used by the phone and gives them icons which is always shown on the notification bar. This way you can always see which sim card you are currently using. Icons can be changed or hidden for easier distinguishing. Dual-sim-adapter users can switch their sim cards with the included Widget. HyperCard 3G, MagicSim 3G (in 007 Mode) and analog adapters are supported.
Download in Android Market if you're interessed and give me some feedback here!
Special Deal: I managed to negotiate a special deal for anyone interested in buying a HyperCard 3G: € 15 discount! Simply use the App to get your coupon code.
Download from Market (recommended for auto-update) or as an attachment from this post.
Don't forget to give it 5 stars if you like it