I went through the same thing over a year ago. I made my transition from Windoze to Linux and the only two programs that I missed where STATISTICA and Endnote. I found two substitutes which do the job, but arenŽt complete clones of what you and I are looking for. Try them out, and youŽll see that they grow on you.
For bibliographies try: JabRef
http://jabref.sourceforge.net/installation.html
Its based on java, so it runs on any operating system and, although it doesnt pipe into OO, it does into Lyx (which I strongly recomend) and into other WordProcessors.
Additionally, it can download citations directly from PubMEd and from ISI-Web of Science.
For Statistics I recomend: MacAnova
http://www.stat.umn.edu/macanova/
It doesnŽt have a GUI, but the commands are based on "R". Nonetheless, it is a lot easier to learn than R. Plus it comes with a complete PDF manual, which you can download and print. It is geared more towards ANOVA, Regression, ARIMA and Multivariate statistics, you can do almost anything you want with it.
HOpe this helps
Camp