How long until current 'stealth' techniques are compromised?

Hi, I've been browsing the newsgroup archives for the last month and haven't
found a clear answer to this question. I find alot of the subject topics
here tend to go off on to talks about politics.

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?

And if these newer aircraft with their current 'stealth' ability become
compromised, I assume importance would go to who sees who first and how good
long range missile technology has become? If that happens, then which recent
aircraft has the advantage?

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?

Thankyou for your time.

muskau