Cross platform scripting language and database

[Joel Hammer]

I need to write some simple software for organizing digital images.
There will be a need to automatically label the images, add comments,
and create a database. There needs to be a pretty GUI for the enduser.

This will run mainly on a windows 2000 box but I would like:
1. to use something beside visual basic or other proprietary software. 
2. to have a cross platform language, since I will likely be developing this on my home computer in large part, which runs lindows. 

So,  of the cross platform scripting languages out there, which ones
are good for windows 2000 and linux? Which ones are simple?

Thanks,

Joel