FunkyDwarf said:
It is true that at certain redshifts (z>1) the universe is expanding away from us faster than c, so yes it is correct to say that there are photons that are emitted beyond this horizon (the observable universe) that will never reach us because space is expanding faster than they can travel.
As noted, expansion of the universe is not a velocity; the units are different. But it does imply that distant parts of the universe are receding at speeds proportional to distance, and these can be arbitrarily large.
However, you need to be careful. It is only in a case of accelerating expansion that there is an "event horizon" marking regions from which no photon can ever reach us no matter how long we wait. This is not the same as the observable horizon, which marks the regions from which photons can reach us up until now.
The other tricky point is that it is quite possible for a photon to reach us, even if coming from regions that are receding faster than the speed of light. Basically, a photon passes into regions with smaller and smaller recession velocities, and can eventually pass into regions where the recession velocity is less than light speed again. In this case, the "proper distance" between us an an approaching photon actually increases at first; but then eventually this reverses and starts to reduce again.
An extreme example of this is the cosmic background radiation, which was emitted at cosmologically small distances in a very rapidly expanding universe. Those photons were intially at a "proper distance" of something like 50 million light years or so; but were being carried away from us (or from the matter from which we were eventually formed) as the universe expands and disperses. It has taken 13.7 billion years for those photons to reach us.
Technical caution: distance is actually ambiguous on these scales; I am using what is called the "proper distance" co-ordinate in this post.
Cheers -- sylas