Hunting Unused Indexes .. is it this simple ?

Hey Everyone,
So, I have a nice postgreSQL server (8.4) up and running our
database. I even managed to get master->slave going without trouble
using the excellent skytools.. however, I want to maximize speed and the
hot updates where possible, so, I am wanting to prune unused indexes
from the database.

is it as simple as taking the output from ; select indexrelname from
pg_stat_user_indexes where idx_scan = 0 and idx_tup_read = 0 and
idx_tup_fetch = 0 ;

And .. dropping ?

The reason I ask is, well, the count on that gives me 750 indexes
where-as the count on all user_indexes is 1100. About 2/3rds of them are
obsolete ? I did do an ETL from mySQL -> postgreSQL but.. that's still a
ridiculous amount of (potentially) unused indexes.

Regards
Stef