In reply to Levy_danny:
I've been using the DexShell Running Lite and Compression Mudder Socks over the last 12 months and have really rated them (in fact, this thread has reminded me that I really need to write up the review). I've tended to favour the Running Lite socks over the Compression Mudders, but the latter come into their own on really rough and boggy terrain, where the main issue is standing in something so deep it goes over the top of the shorter sock. For everything else the Running Lite is infinitely preferable, not least because it's a lot easier to get on!! They feel pretty luxurious on training runs too, so it's not just about the big stuff - they're great for the short runs too.
I'd second what maybe_si says about the Buffalo Mitts, because they really are the best. I've used a lot of gloves/mitts within my life and the only thing that comes close are Dachsteins. I've also rated the Montane Via Shift Gloves, and like the look of the very similar (but slightly more insulated) Via Switch, as they're really adaptable. For me this is a major appeal, because anything that allows you to keep moving efficiently without stopping is a huge plus - particularly within full-on winter conditions, where stopping essentially equates to getting cold.
On that note, find a decent running pack/vest that has plenty of accessible storage. There's a distinct chance you've got one already, but as per the sentiment shared above - having everything to hand (as opposed to hidden deep within your pack) is going to mean you can keep running - and keeping running means keeping warm.
The only caveat to that is, as another poster has said, that if you do need an extra layer on don't leave it too long before you put it on, because once you're cold it takes a long time to come back.
There's probably 101 things I'm forgetting, but that's enough for now.
See you at the Trigger!