For those that don't read the development list; there has been considerable discussion recently (following Khaled's PG vs MySQL benchmarks) about improving PG support in drupal 6.
I haven't followed the whole discussion in detail (so please correct my if I'm wrong or have missed something), but it seems that for PG support to be sustained and/or improve in drupal6, more PG testers and developers with an interest in PG support are needed.