Wow. Good thing I wasn't depending on it for Scotland!

Below is a schedule for the issuance of the Tax Relief Checks this summer.

Week    Last 2 digits of your SSN    Receive your check by week of
1           00 - 09                              July 23
2           10 - 19                              July 30
3           20 - 29                              August 6
4           30 - 39                              August 13
5           40 - 49                              August 20
6           50 - 59                              August 27
7           60 - 69                              Sept. 3
8           70 - 79                              Sept. 10
9           80 - 89                              Sept. 17
10         90 - 99                               Sept. 24

For married taxpayers who filed a joint return, the first Social Security Number on the return determines the mailing date.

Here's the breakdown according to MSNBC:
If you made less than $75,000 in 2007, you get $600.
A couple earning less than $150,000 gets $1,200 back, plus an additional $300 per child.
If you made at least $3,000 but paid no taxes, you still get $300.