Each January, Jakob Neilsen’s annual intranet design annual is released. This showcases the top ten intranets of the year, and is a good indicator of trends in intranet design and usability.

This year’s Neilsen report found intranets are becoming a higher priority for organisations, intranet teams are growing in size, and increasing numbers feature mobile accessibility and social networking.

On the face of it, the improved functionality comes as no surprise. Mobile internet and social media has grown exponentially over the past few years. Our experience of using the web creates expectations of the kind of content and functionality we want at work too; as we rely on our iPhones to do everything for us when we’re out and about, we expect to be able to use our intranet on it too.

That intranet budgets and teams have continued to grow despite the long recession reflects a growing realisation that intranets can deliver real return on investment for organisations.

Significant and measurable returns can be made by making information easier to find – quite simply, less time spent searching for things is more time people can spend doing something worthwhile. Functionality like self-service HR can see sizable reductions in administration costs.

Less easy to measure, though, is the value of the intranet in improving engagement. Last year’s MacLeod Review on Employee Engagement (from the Department of Business, Innovation and Skills) found that more widespread adoption of employee engagement approaches could impact positively on UK competitiveness and performance, and meet the challenges of increased global competition.

Good intranets not only make life a little easier for colleagues, they improve communication, facilitate collaboration, enable people to connect and have their say, and help workers feel part of their organisation. This, in turn, encourages employees to say, stay, and strive.

Another study out this month, from communication research specialists Melcrum, would suggest organisations have heeded Macleod’s call for greater focus on engagement.

In the survey of 2,212 senior communicators, 40% said the business case for social media within internal communication was clear and that there is visible return on investment, while 53% of those who responded said they were planning to increase investment in their organisation’s intranet in 2010.

The results of this study show that not only are organisations investing in good intranet design, but also in functionality and content. When asked about channels used for internal communication, the intranet ranked as the most effective channel by 73% of senior communicators worldwide, with a clear majority believing webcasts and video would grow in importance in 2010.

Respondents highlighted a wide range of business benefits from investment in internal social media. These included improved levels of employee engagement (21%), better communication with remote workers (16%), knowledge management and collaboration (25%), improving employee feedback (20%) and making business leaders more visible and accessible (14%).

Both the Neilsen and Melcrum studies show intranets are maturing. Increasingly they’re moving away from being a simple repository of information and becoming instead a platform for communication, collaboration and engagement.

Victoria Mellor, CEO of Melcrum said: “There is a fundamental shift happening with how information flows inside an organization. Peer-to-peer online networks are enabling real-time feedback from employees to inform decision-making, not to mention facilitating collaboration between remote workers.”

With budgets tight, the pressure is on for organisations to demonstrate value for money. But with growing evidence of the business benefits of investment in intranets and internal social media, it’s clear they’ll play an even more important role in 2010.