I had reeeeaallly slow startup-times with OOo 2.0 - around one or two minutes.
I then found out, that those minutes are used for searching for a usable Java Runtime Environment. I have Blackdown-Java installed - but that's not good enough. On the net I even read, that some people had to install the 32bit version of Sun Java...
I just disabled the use of Java and voila, it starts up quickly.. nevertheless - I think, this behaviour is a little bit questionable...!?