My lender needed it mainly to check that my income has been increasing since I started my position I believe. I actually called the IRS and they were able to fax it without sending in that form. It took about 15 minutes total to have the 3 years in my hands so you probably would rather do that.
7/23/2009 eq 650 tu 676
7/13/2009 EQ 642 TU 658
6/15/2009 EQ 631 TU 629 EX 623 (Lender Pulled)
2/8/2009 EQ 609 TU 589
10/7/2007 EQ 498 TU 507