Today I found this entry on Steven Chan's Oracle E-Business Suite Technology blog. It's titled "Oracle Database 11g Release 1 (22.214.171.124.0) Certified With E-Business Suite Release 11i".
EBS 11i uses the Developer 6i techstack, for which extended support ended last january. I think it's great (and highly amusing) that Oracle now blessed this configuration. There was probably a lot of customer pressure, so Oracle realized that reality does not conform with their product support plans ;-).
I also wonder if this certification only applies to EBS 11i or Dev6i in general (i.e. also good old client/server deployment). Probably not, but one can hope.