When I create a logo, I export it in multiple formats and sizes, all
ready-to-use, mainly for the convenience of the people who are going
to be using it. These include:
Vector versions in .cmx, .cdr, .ai, .eps, .dfx, and .wmf or .emf
Bitmap images optimized for on-screen use in two or three different sizes.
Bitmap images for printing, exported at specific sizes for such
different uses as business cards, name badges, letterheads,
E.g., logo3inch.tif logo3inch.bmp logo1inch.tif
Included with the bitmaps is a caution not to resize them beyond
5-10%, instructions as to when to use which format, etc.
Sometimes people even listen :)