ERROR: nodeRead: did not find '}'

Hello,
it seems my postgresql data has somehow become corrupted (by a forced
shutdown I think):

psql template1 -U shadow
Password:
ERROR: nodeRead: did not find '}' at end of plan node
Welcome to psql 7.3.4, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help on internal slash commands
\g or terminate with semicolon to execute query
\q to quit

template1=> \d
ERROR: current transaction is aborted, queries ignored until end of
transaction block
template1=> abort;
ROLLBACK
template1=> \d
ERROR: nodeRead: did not find '}' at end of plan node

Every command that tries to access a table gives this error...

pg_dumpall says:

pg_dump: SQL command failed
pg_dump: Error message from server: ERROR: nodeRead: did not find '}' at
end of plan node
pg_dump: The command was: select (select usename from pg_user where
usesysid = datdba) as dba, encoding, datpath from pg_database where
datname = 'cinema'
pg_dumpall: pg_dump failed on cinema, exiting

What can I do ?