I have been managing my stock portfolio with OOo for years.
Recently I migrated to 2.0.  The file works just fine in 1.1, but crashes
OOo 2.0.  I've done a lot of fault isolation for you:

Attached is a file with a SINGLE cell filled in that will crassh OOo on 
either a Mac or Linux.  (For example 2.0.3 under Linux.)

I got this file by taking my original portfolio file, and pruning away stuff in
OOo 1.1 until I was down to a single cell and whatever other metadata has been
kept in the file from OOo 1.1.

Repeat by:
1. Open the attached file "Portfolio-Boom.sxc" in OOo 2.0
2. Attempt a SaveAS in ods format.
3. Watch the core dump!

Other things I can tell you:
Opening the original file and attempting to delete a sheet will coredump OOo 2.0.
Creating a copy of the joriginal file by using the "Move/Copy" command under
Edit->Sheet to create a sheet-by-sheet copy will give you a file that works just
fine.

So there's perhaps something in the metadata about sheets that's killing OOo 2.0?

Please let me know how I can help find and fix this bug quickly.  We don't want
loyal OOo users converting to 2.0 and having their financial records go BOOM
when they try to write them out!

This looks like a SERIOUS problem.