I often connect to Internet via GPRS and I would like to disable loading images to save my traffic. Is there a way to disable pictures in Chrome?

Sorry, I have found it myself. There's a -disable-images switch. It works

But it doesn't show alt text, when images are disabled.

Yes that's one thing i noticed also when playing around with the switches, alt text is not shown with images disabled which isn't good behavior. No doubt this will be corrected in future versions.

If you are browsing via GRPS you may also want to switch off DNS Prefetching and also the Malware feature because this is very bandwidth intensive. Most PC's have some form malware detection bundled with the Antivirus/Firewall.