These beers are naturally lighter in body, and have a delicacy to them that you don't realy get from any other sort of beer. They have all the soft malt character of a good ale, usually overlaid with a reasonable amount of hops. As Zak says in the video, they are the traditional ale-drinkers summer choice, having the refreshing lightness of a good quality lager, and the classic softly-wound complexity of a classic ale.
The beers featured in the video are just the tip of the iceberg. We have more than a dozen great ales between 3%abv and 3.9%abv - to see those listed, you can click here. Incredibly, there are another 80 beers listed between 4%abv and 4.5%abv, which you can see by clicking here. But 80 beers isn't really narrowing down the search, and there are also a few darker beers in there too - good for drinking at barbecues, but not to everyone's taste. So with a little bit of playing around with the search boxes, we can narrow the mixed case down to around a dozen pale golden session ales - click here to see the selection, and mix yourself a case from these summer session ales.