Favourite headphones for running with?

I've got to add to the all-round enthusiasm for the Sennheiser PMX70.

 I should also add that they have another benefit over the in-ear canal ones, which I use when normally on the go. With the Sennheiser's sound is ok (but inevitably you are missing out on some deep bass) - BUT you can actually hear what's going on around you in traffic. Noise cancelling sounds like a bad idea to me if you run in a busy city - and if like me you already run with a unhealthy disregard for life and safety, like jumping traffic-lights where you can. You *want* to hear that white van coming speeding towards you So, thumbs up for the PMX70's decent sound and comfort and inbuild safety feature.

Wow... £6.99 for running headphones.  Bargain.

I just upgraded to some SoundMAGIC E30's (the replacement for the PL30). Very nice fit, truly incredible sound.  Best of all they stay really secure, with with over ear cabling.

Can't really find a decent pair of headphones for running looked http://www.headsetonline.co.uk/sports_headsets_headset_online.html, but i'm not sure which one to choose! anyone help?

the Sennheiser 680 range are specifically designed for sports, the cable is anti tangle and stronger kevlar, they come in various types from buds to round the neck versions, the in ear ones have little rubber fins that tuck into your ear so they never move when running, i like those the best, 

i prefer the MX680 over the CX680 because, whilst the CX has the better sound due to its in ear design (the MX sit in the ear like iphone/pod headphones, as opposed to the CX that go into the ear hole with the soft rubber cups) they are too noise canceling, and even down low you cant hear traffic, i generally only put my music on once i'm on the trails but rather than have them bounce around i leave them in whilst i run there on the roads with music paused, you can still hear the traffic well with the MX and PX 680 design

anyone try Yurbuds yet? http://www.headphonehub.co.uk/product-category/brands/yurbuds-brands/

I saw them in a mag the other day, apparently they 'never' fall out. 

Yep find Yurbuds by far the best.  I had all sorts and none really lasted.  Furthermore I was not enamoured with the sound quality, nor, after 30-45mns, their fit when I started sweating.

Yurbuds have for me been the ones I have settled on and will replace like for like as and when they will break down.

Now if one could only find these in BT format without the wires I would be even happier.

I'm with James Siggers. soundMAGIC PL30's (now E30's)

Great sound, never come loose.

I purchased one of these sony players, no annoying wire, and surprisingly well fitting and easy to control. When running down a steep hill they can pop out a bit but other than that I'm very happy with it...     

http://www.fatmanunleashed.com/w-series-walkman-mp3-player-review/

I use my trusty Sony MDR 150s. They cost me £12, the sound is awesome and they're very comfy (Even if they do give you sweaty ears).

I've never been a fan of the in-ear style of earphones, I've never found them comfortable.