looking for a data format

Hello,
I am looking for a standard raster format that I can use to store my 
calulations.

I am doing some numerical calculations (with IDL or Python) on geodata.
Currently I use a self-definded raster format storing my data in float 
arrays using a binary file.
I would like to shift to a format which can be read quickly with many 
GIS programs and would be OGC conform at best.

Do you have any suggestion?

The site:
http://www.giswiki.org/wiki/Kategorie:Raster
didn't help much.

Thanks and kind regards,
Tim Michelsen