Developing aquarium hobbyist software

I am part of a team of software designers looking to put 
together a truly professional program targeted for both
beginning and advanced aquarists.  It will run on both
the Mac and PC.  What I would like to know from
you are the features you'd like to see in this program.
If you want to avoid clogging up this site, please feel free
to respond directly to me.  Thanks.