It seems alot of importance is put into stealth for aircraft these days,
just wondering who is working on a countering radar system for it?


I guess nobody working on it now as many developed countries for example US,UK
and Germany have already very capable counter LO multi-statics available.
(West) Germany was the first nation that started with the development of
counter LO systems in post WWII,in 70s german magazine "Stern" published a
small article about (German) government pork and among many others called a
project sponsored by German ministry of Research&Technology a gov't pork as the
energy efficiency of this form of radar was much lower than conventional
radars.
Of course the "stern"authors did know anything about about stealth platforms
when they published this article and critized this radar development as a n
unneccesary development..
More than 30 years after they developed first dedicated counter LO
radar,Germans still have the most capable counter LO system as newest
generation of German counter LO system is capable of extracting target data
from polarisation data.
US and UK systems are also very capable,US system is even capable to produce an
image of target for ATR purposes but their computing power requirements are
much higher than German system and also they could be more easily jammed.

And what about companies such as MiG who have been rumoured to be working on
a non-standard stealth system? I don't know any details, but I am wondering
if it designed to reflect radar away from the listener or if it absorbs the
radar itself?

In the era of HPM weapons,trying to absorb incoming electromagnetic energy
would be suicidal,you must try to reject as much electromagnetic energy as
possible,if you only could of course!.