Good news. According to the new billhere newsletter, there is now a free public shuttle running from the Fashion Show Mall on the strip to the new Summerlin Resort and back.

FROM: Sak's 5th Avenue at the Fashion Show Mall.
TO: The Regent Grand Spa Hotel Porte Cochere in the Resort
at Summerlin:
Monday thru Friday: 11 a.m.; 1 p.m.; 3 p.m.; 5 p.m.; 7 p.m.
and 9 p.m.
Saturday: 11 a.m.; 1 p.m.; 3 p.m.; 5 p.m. and 7 p.m.
Sunday: 1 p.m.; 3 p.m. and 5 p.m.

FROM: The Regent Grand Spa Hotel Porte Cochere in the
Resort at Summerlin.
TO: Sak's 5th Avenue at the Fashion Show Mall:
Monday thru Friday: 10 a.m.; noon; 2 p.m.; 4 p.m.; 6 p.m.
and 8 p.m.
Saturday: 10 a.m.; noon; 2 p.m.; 4 p.m. and 6 p.m.
Sunday: noon; 2 p.m. and 4 p.m.