Disk Usage Problem

My database cluster at 22 GB is outgrowing the 30 GB partition I set
aside for it.

I periodically dump the cluster to a development server, but when it is
loaded onto the development server, the cluster takes up just 145MB.

I use temporary tables fairly extensively in a key part of the application.

Here are the biggest tables in the production system:

relname | relfilenode | relpages
---------------------------------+-------------+----------
pg_attribute_relid_attnam_index | 16609 | 2519264
pg_attribute_relid_attnum_index | 16610 | 98014
pg_class_relname_nsp_index | 16614 | 25220

I'm using 7.4.7-6sarge1 . I vacuum nightly and do a full vacuum weekly,
but this doesn't seem to have any effect on size.

TIA

Michael