Don't hold me to this...there may be some errors, but as far as I can tell, these are the on-sale dates I have seen so far:
Prop. Presale 3/8, U2.com presale 3/9-10, General sale 3/12:
20th September Chicago - United Center
21st September Chicago - United Center
03rd October Boston - Fleet Center
04th October Boston - Fleet Center
16th October Philadelphia - Wachovia Center
17th October Philadelphia - Wachovia Center
19th October Washington - DC MCI Center
20th October Washington - DC MCI Center
24th October Detroit - Palace of Auburn Hills
28th October Houston - Toyota Center
29th October Dallas - American Airlines Center
16th November Tampa - St. Pete Times Forum
18th November Atlanta - Philips Arena
19th December Portland - Rose Garden
Prop. Presale 3/8, U2.com presale 3/9-10, General sale 3/13:
01st November Los Angeles - Staples Center
02nd November Los Angeles - Staples Center
Prop. Presale 3/8, U2.com presale 3/9-10, General sale 3/14:
07th October New York - Madison Square Garden
08th October New York - Madison Square Garden
10th October New York - Madison Square Garden
Prop. Presale 3/15, U2.com presale 3/16-17, General sale 3/19:
12th September Toronto - Air Canada Centre
14th September Toronto - Air Canada Centre
25th September Milwaukee - Bradley Center
22nd October Pittsburgh - Mellon Arena
13th November Miami - American Airlines Arena
25th November Ottawa - Corel Centre
26th November Montreal - Bell Centre
07th December Hartford - Civic Center
09th December Buffalo - HSBC Arena
15th December Omaha - Qwest Center
Prop. Presale 3/15, U2.com presale 3/16-17, General sale 3/21:
17th December Salt Lake City - Delta Center
Haven't seen any dates for:
23rd September Minneapolis - Target Center
10th December Cleveland - Gund Arena
14th December St. Louis - Savvis Center