Update: Andrew’s posted a great video walkthrough of the Skype for your mobile interface.

Today, Skype has released a beta version of Skype for your mobile, a mobile thin client for Java-enabled phones.

The full set of features for Skype for your mobile beta include chat, group chat, presence (seeing when your contacts are online), and, making Skype-to-Skype and SkypeOut calls.

Note: When you make calls, you’ll be charged by your operator just like you would for any normal phone call — so if you have inclusive minutes, a Skype-to-Skype or SkypeOut call will use up these minutes.

There will also be some data charges for the handling of presence and chat messages — again, you’ll be charged by your operator as normal for these. An unlimited data plan is recommended, but we reckon that a person with 20 contacts, who’s online for 1 hour, Skype chats for 10 minutes and has a 20 minute call each day will use about 1MB of data per month. The more data you use, the higher your charges may be, of course.

As an optional feature, you can also receive calls from other Skype users and via your Skype online number — this is supported in the UK, but not everywhere in the world.

It’s been tested on around 50 different handsets from Motorola, Nokia, Samsung and Sony Ericsson, but is likely to work on others too.

For full instructions on how to download it, visit the Skype for your mobile page on the Skype website.

Of course, if you’re in the market for a new phone, the 3 Skypephone offers an integrated Skype experience with no Skype-to-Skype call or data charges, so long as you top up your account with £10 per month.