I read over on toyotanation about the TSB for replacing the saggy suspension on the 05's and 06's.
Since I have an 07 I was frustrated but complained to the dealer anyway about the soft suspension on our 4x4 SR5 non-TRD Tacoma.
Anyway good news...the TSB has now been updated for the 07s so I will be getting 4 new Bilstein shocks, new rear springs, U-Bolts etc installed for free by the dealer.
Here is the original thread over on Toyota Nation
I have the PDF of the 05 06 TSB if anyone wants it to show the dealer.You are basically getting a TRD suspension for your Pre_Runner or SR5 4x4...for free. :-)