Wish: Input / output for Open Document Spreadsheet (ODS)
It would be nice to have, along with XLS and XLSX, also support for ODS (used notably by OpenOffice.org and Libreoffice, but not only that). 

The main problem I saw is that there's a plethora of libraries to handle that: however not sure which is the "best" one (with a licensing that would fit with pandas).
