How can I work thru this key problem?

I am using
6.5 postgresql
DBD pg 0.91
DBI 1.08

I have a table that looks like:

create table exampletable (
keyiwant int4 default nextval('thenextkey') not null,
otherinfo varchar(20)
);

When I place, oh say the string "Whatsmyid" into exampletable, I'd like to
be able to know the value of keyiwant is, without going back and doing a
select keyiwant from exampletable where otherinfo = "Whatsmyid"

Ideas on how I can get to where I want to go?