Have just signed up for Skype Pro which seems really good value:
First five months for just €10 (excl. VAT).
Upgrade to Skype Pro
€10 for five months
Pay nothing per minute to national landlines.
€30 discount on SkypeIn numbers – people can call you at local rates.
Includes €5 Skype Credit as a special introductory offer.
Free Skype Voicemail – takes your calls while you’re busy or offline.
* Save €30 on a Philips VoIP 841 cordless phone.
* Save €10 on an SMC WiFi phone.
* Exclusive discounts on Unyte Desktop Sharing Extra.
* Two free animated avatars from CrazyTalk.
* Three free ringtones from Emotive.
There are some restriction on countries, but as we only really call the UK and USA and they are both included this is good enough for us!