Sweet Jesus!!! what would i be able to do without QCAD!!! I am a mechanical engineer and i have being working in design for over 8 years now and i must say it is a very big deal to be able to use CAD in doing your work, for all those people still using pencil and papers in making their engineering drawings i would say wake up!!! So, cheer QCAD for making my life a lot more easier and my work a lot more interesting!!!
[Edit: Topic moved and welcome Parocce]