The following comments from Stewart Reuben were sent to me by email for posting here. His direct comments in italics:
"Mike Yeo expresses concern about cheating with players leaving the tournament venue and phoning a friend. Using a phone in the playing venue (which includes the toilets and refreshment area) is strictly forbidden, so that I think the Monroi device offers no new problems there. After all, you could send a message to Fritz or a friend and get a reply in the current setup.
"Mike correctly says that the cumulative add-on of 30 seconds is inadequate when using the devices. He is absolutely correct and I believe 30 seconds is inadequate anyway. When I wrote the FIDE Law that score had to be kept throughout when there was an add on of 30 seconds or more, I had no intention that it be solely 30 seconds. Events I run have an add on of one minute as in Gibraltar and Hastings. David Welch and I agree we would not use Monroi with only 30 seconds. Indeed, ordinary scoring is also too difficult for some older people with only 30 seconds. They may have to use two sets of glasses.
"Only events run by British and Australian arbiters use an increment of one minute. The world is out of step with us. Stewart Reuben."
In a separate email, Stewart says he thinks that they may not have used DGT in Dresden but may be building their own system for use at the 2008 Dresden Olympiad. I have no information about this - can anyone comment? Given the inconsistent output from the 2007 Euro Dresden website, it is hard to have confidence in such relatively untested technology with only a year to go. Stewart also makes the point that DGT boards have not been used for Olympiads to date. Russian boards are used. I have no information as to the brand.