Anyone got any good recommendations for a good portable pump. I've got a zefal Z3 which I can't get to work, well no air seems to go in the tyre. I also have a SKS mini-pump, which gets the tyre reasonable full of air, but not that hard. It also now I'm home seems to have broken the presta valve on the inner tube.
I've got a CO2 device which is fine, but today I needed to pump my tyres up at the road-side, and couldn't get much air in them and had run out of CO2 cannisters.

Topeak Pocket Rocket, around £13, aluminium barrel, will eventually get to around 100lbs. psi. Comes with a bracket that fits on bottle cage braze ons, or small enough to stash in back pocket of your jersey.

Get a Blackburn frame-fitting pump and you'll never struggle to inflate a tyre again.

I've been using a cyclaire pump for the past couple of years. Pumps up to 100 psi + faster then any mini pump, and has a built in pressure gauge for accurate inflation.

I've got a small frame fitting Blackburn that has got me home a few times.

I certainly do. It came in use today, when i punctured riding into work. The only shortcoming is that it's a bit, um, short, but there is a longer version in development. That one should be perfect

I too vote for lezyne alloy drive (or maybe I have a pressure drive) pump but thought it was a bit long....!  It's the closest size I could get to my old 4 section plastic one which was just the same length as a folded tub so fitted very neatly.  Old one wasn't very efficient but good enough to get home.  Didn't want CO2 running out of refills and crank bros power pump had strange hard/sharp lumps that would scuff everything

I have a Wrench Force Pint Sized one. Small (pint sized), light, useful and not ridiculously expensive.

I have a Topeak Micro Rocket - ridiculously small, but does do the job...eventually