I'd second Tim Stockdales series - really good. Apparently the dressage for showjumping DVD with Richard Davison and John Whitaker is also very good - am waiting to borrow it from a friend.
On a different issue I also found "Think Equus by Michael Peace" guide to clipping difficult horses very helpful.
love the funnell factor, have got tim stockdales dvd's also think they are very good, so does he , he offered to give me my money back out of his own pocket if they didnt improve my riding! but have to say i agreed with him. i find watching dvd's of badminton, burghley, hickstead things like that very helpful if the commentary team is good
Tim Stockdales SJing is great.
Whitaker and Davidson dressage/sjing dvd is super imo
Like the Riding the Young Horse by Pippa Funnell i find interesting. If i cannot afford a lesson i watch these as they give me ideas of what to work on.