Blaise Mouttet has written numerous papers and online comments which challenge the claims put forward by memristor proponents[1][2]. Debate surrounds whether the device created by HP is a memristor or simply a varistor[3][etc]. The heated debate has been widely publicised in the scientific community[4][etc] and is still ongoing. According to [3], Blaise has an interest in preventing a patent land-grab over these technologies on the basis that the patent claims may use unjustified science.
I also note that the 2008 symposium talk by Leon Chua made mention of Memory Capacitors and Memory Inductors[5]. Stanley Williams started the next talk by thanking Leon for the challenge posted to systems implementers to find and use memory capacitors and memory inductors. If the missing circuit component is the memory resistor (confused with the varistor?), where do memory capacitors and memory inductors fit in?
[1] http://vixra.org/author/blaise_mouttet
[2] http://arxiv.org/find/all/1/all:+AND+Blaise+Mouttet/0/1/0/al...
[3] http://www.newscientist.com/article/mg21328535.200-online-sp...
[4] http://www.eetimes.com/electronics-blogs/other/4236273/Memri...