You want to install a houndred new apps from android market. as u know, every day android developer release new great apps that you want to add it to your phone.
In order to install third party applications to your Android phone, you need to install APK, or Android Package, files.

How to Install Android Apps from Android Market:

1. Copy the APK file to your Android’s memory card and insert the card into your phone.
2. Download and install the Apps Installer application from the Android Market
3. Once installed, the Apps Installer will display the APK files on the memory card.
4. Click and install your APK files.

1. download and install the Google Android SDK program and the Android USB drivers. The download links are as follows: http://code.google.com/android/intro/installing.html
2. http://dl.google.com/android/android_usb_windows.zip
3. You need to modify your Android’s settings to allow the installation of applications from other sources. Under “Settings,” select “Application Settings” and then enable “Unknown Sources.” Also under “Settings,” select “SD Card” and “Phone Storage,” and finally enable “Disable Use for USB Storage”
4. This last step is easy. Open Command Prompt and type the following: adb install <1>/<2>.apk
5. However, when you type the command, replace <1> with the path to your APK file and replace <2> with the name of the APK file.