poster_boy - 8:14 am on Jan 15, 2008 (gmt 0)

Do you notice any difference in the effectiveness of campaigns on different days of the week in travel or indeed in any niches?

Absolutely. In my non-travel niche, I've seen day of week and time of day be very consistent in terms of their unique traits of effectiveness. Sometimes, it's almost bizarre how consistent shoppers react over the course of time...