We used to work with spark factor during our first year at F5 Networks, which was an exciting time when we were growing quickly! They had good people who made great ads for us as well as created some awesome content pieces that got noticed by clients or partners of ours (the TV show "Diners Drive-Ins & Dives" did feature one such piece!).
I am sad they are not still around because it would have been interesting hearing about their growth story from someone other than myself - but maybe there will be another creative agency out here soon? Maybe this could change if you're looking into working w/a new ad co.?