Thanks for your feedback guys :)

I've had a look through all the stats and all the records where just numbers are recorded are coming from images.google.com. This suggests that the search term that is being sent through contains something like the image dimensions. Although this info isn't very useful I don't think we can filter it out because this would stop searched containing numbers.

I have 399 and 600
Would be interesting to known what they mean :)

Probably indicating screen resolutions :)

When I first set up my site the site statistic search terms showed the actual words that had been used to search and find my site - very useful.

Now the vast majority of these search terms are no longer words but numbers e.g. 600, 570, 824, 1024 etc. These make no sense to me, any ideas what they mean please?