Issue with the Apps that are installed on SD Card after reinserting the SD Card
Try rebooting the phone after re-inserting the SD Card.

Some older launchers (e.g. Eclair stock) simply don't refresh their app drawer when you re-insert the SD Card, even though the apps are re-mounted. You can check that the apps are indeed back by going to Menu -&gt; Settings -&gt; Applications -&gt; Manage applications and seeing if the "missing" apps are listed there. If so, a reboot will fix it.

Alternatively, you can simply restart the Launcher app by going to Menu -&gt; Settings -&gt; Applications -&gt; Manage applications then scrolling down to "Launcher" and tapping on it, and then tapping on the "Force Close" button.  Now if you press the Home key, the Launcher will restart and should have all the apps back.