Is the one I am looking at currently, so that I can take low-level shots without having to bend in awkard ways. There's many more areas where this would be *really* useful for me.
I recently bought a Seagull 1x-2x right angle finder off of ebay for about $70US (with the shipping).
It took a while to arrive (3 weeks) but I am fairly impressed so far.
I like that it rotates so I can use it in portrait orientation as well. Optically it seems decent and the build quality is good. As it came with several adapters I am ceratin it will work on the D-70.
If you want one that rotates make certain you order the 1x-2x version. It costs slightly more but I think the ability to use it vertically far outweighs a couple extra dollars.
The end of the beginning is the beginning of the end.