  The jets seen in NGC 6543 motivated us to search for similar features in
other PNe. Our HST snapshot program looked for jets using the [N II] and
H-alpha narrow-band filters. Although spectacular jets are found in proto-PNe,
true jets seem rare among mature PNe. In the later group, IC 4593 is the best
case in our sample. We distinguish between jets and a number of interesting
``jet-like'' features, e.g., ``cometary'' structures with a dense globule at
the end facing the central star.
