Well I really don't like chaining more than one of them together... I think it's important to draw attention to everything on the console though, so good sharp thumbs and a nice design, target=_blank a must.
Also I really like having a pop with a special price point on the join page, ie. full price join option only but when you exit you get a pop offering you the trial... Have set this up for a few programs and it's nice to see those trial joins start coming because you know they would have left otherwise.
I'm using some great ie7 code but it still doesn't pop on firefox or google toolbar so will have to look into that.
