Julie Felix still performs and still has Led Zeppelin connections today. In fact, she met up with John Paul Jones at two of her live appearances this year. Both were in England to support the Mines Advisory Group, http://www.mag.org.uk.
(Update: Web content from here on out is no longer available.)
Most recently, Felix and Jones performed together earlier this month at a bookstore in London. Details and several photos from that appearance can be found at http://www.linwood.demon.co.uk/jpj120402.html courtesy of Tight But Loose. Dave Lewis had a chance to interview Julie Felix before she performed. Among the topics discussed was how Jimmy Page got to perform on her show in 1970.
This interview will be found in the next issue of Lewis' magazine, Tight But Loose, established in 1978 as the original Led Zeppelin magazine. See http://www.linwood.demon.co.uk/subscrb.html for subscription information.
Elsewhere on Tight But Loose's Web site, you can find the latest tour dates from Robert Plant and John Paul Jones. Jimmy Page is not expected to tour this year, but any gigs he does will be covered with the rest, at http://www.linwood.demon.co.uk/tourwat.html.