transposing data for a view

I have a generalized table:

scanid | region | volume
-------------------------
1          A      34.4
1          B      32.1
1          C      29.1
2          A      32.4
2          B      33.2
2          C      35.6
.
.
.

I want to create a flattened out view that looks like the following:

scanid | A_volume | B_volume | C_volume
----------------------------------------
1        34.4         32.1      29.1
2        32.4         33.2      35.6
.
.
.

How do I correctly/efficiently construct a psql query to
pivot/transpose the data?  I am using postgreSQL version 7.0.x

thanks,
Jeremy