I've been watching these since earlier this year and think the upward movement on low volume is intriguing. Just 100k shares have been traded in the last 3 working days, seeing the sp rise 30% from 47p to 63p.
Like someone already said, either ROM is tipped as a share to watch in 2005 or, more likely, that folk have only just woken-up to the fact that the FY results due out in two weeks are likely to show EPS of 3p.
Compare that to ZYT, its former stable-mate - following a near 50% rise in its sp over the last quarter, now with a PE of 80.