How to make your Android phone detect Ad Hoc Networks

This works for Froyo, I don't know about the other versions.
*DO THIS AT YOUR OWN RISK*

You will need ADB, to know what it is, follow this LINK.

You will also need this file.

Once you have ADB and have downloaded the file above, connect your phone in USB debugging mode to your computer and run ADB in the windows command prompt.

Enter these:

adb shell mount -o rw,remount /dev/stl12 /system
adb shell mv /system/bin/wpa_supplicant /system/bin/wpa_supplicant_original

adb push wpa_supplicant_adhoc /system/bin/

adb shell chmod 755 /system/bin/wpa_supplicant_adhoc

adb shell busybox ln -s /system/bin/wpa_supplicant_adhoc /system/bin/wpa_supplicant

--

You can also share your internet connection through your ad hoc network by enabling network sharing when you set-up your ad hoc. :)

Turn your computer/laptop to a wireless hotspot compatible with Android

Itching to share your internet connection to your Android phone but you don't have a wireless router? Don't want to go through the process of modifying the wpa_supplicant file on the Android's system files and using an ad hoc network? Turn your laptop to a wifi hotspot! Do this by using Virtual Router, a software that creates a virtual wifi connection using your computer's wireless adapter, but requires Windows 7.

Get it here. http://virtualrouter.codeplex.com/
Install and run the software on your laptop.
Create a network.
Connect your Android phone!

:)