The Java version installed with Slackware 12.1 is, according to javatester.org, 1.6.0_06.
This version fails with my online banking, and according to the bank it's because there's a bug in 1.6.0_06, which is fixed in 1.6.0_07.
My confidence in the technical prowess of my bank is extremely small, but seeing as they refuse to help me as long as I'm using this "obsolete" version, I would like to plea for an official update to 1.6.0_07.
In case I'm the only one with this problem (very likely!), I guess I can always grab the official slackbuild script and build it myself. In that case, is there anything I should be aware of?