I submit some of my internal pages to about 5 or 6 social bookmarking sites once a week or so. I not only submit my gambling related urls, but alos non-gambling related urls (not my competition) just so my accounts look natural. So, for each site, I'll submit 1-2 urls per week on average.
Article distribution: That's a tough one because unique content costs time and money, so where I spend my unique content matters. What I usually do is submit my unique article to ezinearticles.com.. After a few weeks I check to see how that article was distributed through their system. If it wasn't picked up, then I'll go ahead and submit the same content to isnare.com. I've actually have a few pages in ezinearticles.com with
PR with great links to my site.
So, with articles.. I submit about 5 per week to ezinearticles.com and 2-3 per week to isnare (nominal value).
If someone else has a better strategy please share.