I see that on your about page you mention only supporting PDFs.

As somebody frustrated by the lack of alternatives to Autodesk products, seemingly due to the lock in by .DWG files[1] not being an open standard, I'd be curious to hear your thoughts? Did you think about/try implementing the file format? Do you have plans for others?

Last week, I told myself I'd give the OSS CAD programs a try, downloaded LibreCAD and tried to open some architecture plans from my inbox. Could not open. Then I read came across an excellent explanation of the problem of DWGs in OSS[2], this is the most frustrated I've been for a while. The industry standard is a proprietary file format with no published specifications.

[1]: http://en.wikipedia.org/wiki/Dwg [2]: http://libregraphicsworld.org/blog/entry/whats-up-with-dwg-a...