Vacuum full

We are using postgres 7.2

Can anyone tell me what the ramifications are if I do not vacuum full the whole DB?

Say if I was to selectively vacuum all of the PG tables, and only some of the Application tables.

We have a number of tables that are effectively archive type tables.  They are large, but do not change. If

I was to vacuum these tables on a regular basis, it would add a significant portion of time to the housekeeping process.