Hi Joshua,
Let's say in Summary!B2 you have a number from 1 to 12.
Let's also say that you have worksheets in the same workbook called January, February etc...
To get the value from cell A1 on the relevant month worksheet, you could use a formula such as this:
Code:
=INDIRECT("'"&TEXT(DATE(2010,B2,1),"mmmm")&"'!A1")
Note that INDIRECT() is volatile.
Hope that helps...