> I'm trying to download some pictures while skipping
> the html and thumbnails. This works as expected when
> I include/exclude by name, but it doesn't when I
> exclude by size. Example:
>
> -"*.jpg*[<20]"

Looks as though the above rule should be this?"-*.jpg*[<20]"

You may want a quick read through these too:

<http://httrack.kauler.com/help/Mirror_only_images>
<http://httrack.kauler.com/help/Filters#Filters6>