Anonymous wrote:OP here, thanks everyone for all the great advice!
I ended up resting my knee for almost a week, first run today -- 3 miles, slow easy pace, tried to keep from "pounding" the ground. Felt a slight stiffness before, did some stretches/walking after; also felt stiffness after, though less than at start, so I've taken some ibuprofen and will take a rest day tomorrow.
Overall I'm going to plan to run 4 days a week for the next month or so, Tues, Thurs, Sat, Sun, building in some squats and lunges on 2 of the "rest" days. I will also look into visiting a running store to get my run analyzed & determine if new shoes/orthotics will help.
I did notice one PP said they had the same issue and after rest for a couple of weeks was able to just continue their regular running, would love that to be me, but I'm being careful for the next few weeks.
Thanks again!
OP here again, just wanted to give an update -- after the run mentioned above, I still had some knee pain, so I the next day I went to Pacers Logan Circle, where the fabulous Jessie spent a good hour with me to find the right shoes. Turns out I'm a neutral runner (I was told years ago at another running store I was an over-pronator) and I got shoes with good cushioning and of course Superfeet inserts

.
In the spirit of letting things really heal I only took one more short run last week, after which knee felt much better but still a little stiff.
This week I've started incorporating some cross-training -- walking and elliptical-- on off days and that seems to be making a big difference as well. I've also decided to stick to just 3 miles a day on runs for the next few weeks rather than try to build on distance. When I do add distance, I'll be following another poster's rule of adding slowly, 10% a week.
Thanks again for all the responses, DCUM is definitely changing the way I run!