Find my iPhone works for me on iPhone 3G
I used my iPad to create my MobileMe account, verified the account and got Find my iPhone working on my iPad.
I then went to my iPhone 3G, downloaded the Find my iPhone app. Went into settings and added the MobileMe account with the login details I used on my iPad and bingo bango, it added the 3G iPhone and both work.
Hope that makes sense!
I used my iPad to create my MobileMe account, verified the account and got Find my iPhone working on my iPad.
I then went to my iPhone 3G, downloaded the Find my iPhone app. Went into settings and added the MobileMe account with the login details I used on my iPad and bingo bango, it added the 3G iPhone and both work.
Hope that makes sense!