What worries me is that this valve doesn't seem to have the two part construction as compared to the valve described above. I haven't been able to find another valve like mine; the "bonnet" and the valve stem nut seem to be the same. I'm in a townhouse condo complex and this is the main water shutoff valve for the house. I think that turning off the water to the house to replace the valve will be a big deal (half the complex with water off, probably hours for the system to drain etc. etc.) although I'm going to investigate that.
Other that replacing or repacking, I could just let it drip. It's a few ounces a week. As long as I catch these drops so nothing of note gets soaked, is there any issue in just letting the drips continue ?