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You might already know this but use great caution when opening any photo flash. The capacitor inside can generate enough of a shock to kill you, even with the unit off and the batteries removed as it stores a "charge".
According to this list the 30DX's trigger voltage is borderline for use with digital cameras. You may be able to use it with no ill effects, or it may fry your camera. It depends on the particular unit.
Yes, though it's an older flash unit and cannot be used in the iTTL mode. The "Other Flash Units" section of the D300s manual (page 350 in my copy) lists the modes in which the flash may be used. Another concern is that the flash may not work well with certain lenses. The "Usable lenses and cameras" section of the SB-29 manual (page 5) discusses this.
If you need manual, you can download the D300s manual from http://support.nikontech.com/app/answers/detail/a_id/16525/kw/D300S/r_id/116678 and the SB-29 manual from http://butkus.org/chinon/nikon/nikon_sb_flashes/nikon_sb_flashes.htm
The old series Vivitar 2800 flashgun has a very high trigger Voltage, that can damage your D60's circuitry. Even measuring the trigger voltage with a voltmeter is not a solution since you can't rely on the voltmeter to indicate the peak voltage.
I also purchased a Bower 724AFN to use with my D80, and experience the same problems. Received confirmation from Nikon that this flash unit is not compatible with the camera. I then purchased an SB-600 flash, and haven't looked back. It's worth the extra money for this high quality unit; fully compatible, and compliments the TTL features of the D80. I'll never deviate from original Nikon accessories again.
This question is far beyond the scope of a single posting on FixYa. Entire books could be written on the subject. In fact, they have been. Both Lark (http://www.larkbooks.com) and Rocky Nook (http://www.rockynook.com) have books dedicated to the Nikon Creative Lighting system.