Editors' Note: This method has become defunct due to updates to the Android Market. You no longer need an app to help you with the process.
1. Download ShareMyApps from the Android Market.
2. Open the app and select the app(s) you want to share. There are buttons in the top right for selecting all apps or clearing current selections.
3. Press the share button up top and choose from one of the sharing options (email, SMS, kik, et. al.)
4. The link to the app in the Android Market will appear in the text entry box of the app you chose so all you have to do is press enter. You can add a personalized note, too.
5. Tell the person you're sharing with to just click the link in order to find the app in the Android Market.
Please note that if the person you're sharing the app(s) with is running a different version of Android, the app may not be available to them. This doesn't happen too often anymore, but it's still a possibility.