Hi. Probably a decade ago or more I used to create banner ads for my employer. At the time I used PhotoShop and Illustrator for animated gifs and Flash for something a little more ambitious.
I haven't done much by way of banner ads since then, but I recently got asked to create some new ads for a client.
What is the current best practice for creating a banner ad? I know a lot of it depends on the specs, the site, and the message, so let's say an informational 670x335.
I would like it to be eye-catching, load quickly, and use the latest technology, which I guess is the part I need advice on.
Thanks in advance.