Instant access when you need it - and no more paying when you don't. TopUp and Go gives you all the flexibility of Mobile Broadband, without the monthly contract.
"With download speeds of up to 3.6Mbps, it's faster than 3G. Your USB Modem even comes pre-loaded with 1GB of data - that's 30 hours surfing, 650 emails and dozens of downloads. And when your credit runs out, simply top up to enjoy more of the same - fast, reliable broadband that covers 80% of the UK.
No contract. No monthly bill. No fuss. Get this cracking deal now for just £34.99 - then top up whenever it suits you."
edit: As pointed out, this price includes a £15 credit, ie, 1Gb of data. I've been a light user of this dongle now for other a month now (on a NC10 with XP) and I still have £13.45 worth of credit.
An additional tip when using such dongles is to turn OFF automatic windows updates/downloads. I caught Windows trying to download lots of updates (lots of Mb's worth) which imv should be done at home rather than via these dongles.