My wife and I are raising our 25 month old as a bilingual child using the OPOL method. We are developing some content to help other Fil-Am Families due the same also, but we haven't gone live yet. The website will be FIL-AM-FAMILY.COM.
Presently, the "best" website that you could use is http://www.seasite.niu.edu/TAGALOG/Tagalog_for_Kids/tagalog_for_kids_fs.htm.
I am unsure how this website BrillKids develops content, we are just on the mailing list from way back in the free Beta days and I just stopped by looking at the affiliate program.