autovacuum not working?

I've recently moved to 8.1 and find that autovacuum doesn't seem to be
working, at least not the way I expected it to. I need the tuple count
for a table to be updated so indexes will be used when appropriate. I
was expecting the tuples count for a table to be updated after
autovacuum ran. This doesn't seem to be the case. I added 511 records
to a previously empty table and waited over an hour. Tuples for the
table (as per pgaccess) was 0. After I did a manual vacuum analyze it
went to 511.

Am I missing something? Should there be something in the log file to
indicate that autovacuum has run?

I'm attaching my conf file.

Medora Schauer

Fairfield Industries