Hello,
I'm an professional in the area of spatial databases. I have 2 years of the intensive spatial database programming experience with PostgreSQL and MySQL. Though I never worked with Oracle Spatial, all spatial databases are based on the same standard (OGC), having very similar data types, functions and so on (for example, projection IDs are also subject to a cross-db standard), and also basic SQL is quite similar between the engines:) So, I don't think there is any problem for me to do something with Oracle. If you're interested please contact me with more details about your project.
Regards,
Alex.