NOTE:
The radio is back in stock.

However, the J&R link now goes to the updated rebate form (not the version you linked to) which NOW requires the following:
http://www.JR.com/media/Rebates/Audio/Radios/Table_Radios/SGN1_20080929_v1_m56577569833333628.pdf

[ ] Yes, I have texted "Upgrade" to 34343.'
Mobile Phone Number = _ _ _ _ _ _ _ _ _ _

I read in a few places that once you opt in (presumably by complying with the text requirements above), they will allegedly send you WEEKLY text messages on your mobile phone.
If you don't have some kind of text messaging plan or free text messaging standard, you'll pay as much as 20 cents per week until they stop (no end date provided).

The rebate form's terms and conditions conveniently don't state this!

Read more about the promotion and weekly text messages here

Discussion about the text "spam" (as the poster put it) on avsforum

I don't know whether they'll honor the "old" rebate form you linked to (link still works)...