One aspect I do look for is a horse that has that has started from outside Front Row Draws and Second Row draws at longer prices and ran accordingly and is drawn in the 2,3 or 4 for today's race. Usually means a rise in class but I have had some good results from such a system..I'm a sucker for systems!
I also look at horses recently purchased from NZ..they might not win first up but it doesn't take them long.
I often find a goodun' where a top free lance driver travels for a lone drive...did well with a McElhinney single drive at Canberra a while back.
Successful trainers are those in the top echelon as it seems to be the case that the top trainers attract clients who supply them with the best bred young horses and no expense is spared as far as veterinary care, feed and facilities as well as securing top drivers for their horses.
As far as successful drivers are concerned, there are those that are attached to top trainers(by family relationships) and those that are employed by the trainers AND there are the free lance drivers that do well.
Of course the penalty you pay with following these Trainers and Drivers is what I call the Tommy Smith/George Moore effect where you get reduced odds the minute punters saw their names against an entrant.
Bit like Waller and Waterhouse these days. Although you do get the odd amazing result..using the gallops again but William Pike(WA Premiership leading rider) rode 5 winners a couple of Saturdays ago in WA and then came out on the Wednesday(I think it was) and rode a $30 winner.

Some of my favoured trainers and drivers:
WA Trainers
G Hall Senior..snagged a really nice priced winner during the week.
Skye Bond
WA Drivers
G Hall Junior
Chris Voak
VICTORIA Trainers
Gaths
Lilley
Victoria Drivers
Anthony Butt..killing it at the moment and gets up on some nice priced horses.
Nathan Jack..particularly if the horse has been backed.
QLD
Dixon
NSW
McCathys