Here are some pretty good APIs ready to use for your favorite project:
JavaScript: https://github.com/steemit/steem-js
Python: http://steem.readthedocs.io/en/latest/
Or just use the JSON API directly like described here:
https://steemit.com/steem/@klye/an-introduction-to-steemd-api-calls-functions-and-usage
If you got an idea for a use-case, let's talk :)
I think i‘ll go with the JSON API purely as a starter with some basic things like gathering and pushing data.
If i‘m comfortable with using the API and the platform itself, use cases will show up. Will stay in touch reg. use cases. ;)
Thanks for the JSON API link.