Using the CONNECT engine you can read (and I think write?) data to ODBC data sources. This is essentially a very cheap IBM Federated system...it's even written by one of their original devs.
Just checked the docs - looks like you can do select, insert and update using CONNECT ODBC. Others are supported too via EXECSRC. Yeah that's quite cool.
I was at a Meetup.com Mysql meeting and one of the talks was on the CONNECT engine. The demo showed CONNECT working with Sybase using all the SELECT, UPDATE and DELETE commands, although the EXPLAIN command didn't show any indexes being used. Still impressive.