There are only a few days left until the close of the XTech 2007 call for participation. XTech 2007 will be held 15-18 May 2007 in Paris, France.

As I wrote last month, the theme for this year's conference is "The Ubiquitous Web", reflecting the many ways, places and devices through which we now interact with and are affected by the web.

XTech 2007 will be comprised of four thematic tracks:

• Applications: web applications, vocabularies, publishing, content management, case studies
• Browser Technologies: browsers, mobile, user interface, related issues and standards.
• Core Technology: the heart of web technology, markup, protocols, semantics and more.
• Open Data: technology, experiences and policy behind open access to data.

All these topic suggestions are of course just that; don't feel you are limited to topics mentioned explicitly in the call.

XTech is always topical, so to take that angle, we'll be expecting to hear about things such as Second Life, mobile and geolocative services, progress in open standards, Ajax toolkits, OpenDocument vs Microsoft Open XML, copyright, identity, best design practices and more.

Just a few more tips based on submissions so far:

• Don't worry if you can't decide which track your submission falls into: just say so in the notes, and the programme committee can place it appropriately.
• If you have something super-secret you can't talk about yet, but can do by May 2007, write to me personally and we'll try to come to a suitable arrangement.
• If you have a great excuse why you need just a few more days to respond to the call, also let me know.

Otherwise, propose away!