The book i have i purchased at advance auto parts, it lumps the tacoma and 4runner together in the same book, so look for the manual that includes the 2001 tacoma and it will include your 01 4runner (there will be a pic of a tacoma on the cover)
That is strange... both Chilton and Haynes seem to stop at 2000. 4runningyota is right, though - the 4Runner is in the same book with the Tacoma and/or the Land Cruiser.