Things I've found useful to help me have a treast yet still stick to my points:
Weight watchers Choc digestives- 1pp each and really nice. They have a bit off the back shaved in so you are getting less calories but pschologically it still seems like quite a big biscuit!
Snack a jacks salt and vinegar flavour - 2pp a bag from a multipack and gives me the idea i'm eating crisps
Curly wurly's -3pp each (learnt on this thread, thank you!)
Minstrels- 5 are 1pp or 10 for 2pp
Mini babybel light 1pp each (again learnt on this thread and the single best tip for me, has saved me on numerous stilton craving evenings
Tuc biscuits for the above- 1pp for 2
Ww west country cream 30g-1pp- this is really very nice and a lot like cream
Sainsburys 1/3rd less fat sausages - I can't really tell they are less fat
Sainsburys no added sugar instant custard- best desert idea- roasted fruit with a 1/4 packet of this for 2pp
Ww crustless cheese and onion quiche 8pp but nice and I do like a good quiche!
Bacon medallions, I buy the sainsbury's ones and they are 2 for 1pp which feels like a lot of food for the point!
Things that have been a waste of money or I haven't liked:
Ww half fat butter- beyond vile DO NOT BE TEMPTED it is chemical tasting horriblness
Ww Cheese flavour bites 2pp - see above, I was led to believe they would be
like mini cheddars, or how wrong I was
Ww salt and vinegar hoops 2pp - ok but dry and nowhere near as nice as snack a jacks, in my opinion!
WW Bagels - yes they are only 4pp but they are a bit grim and I much prefer new York bagel company wholemeal bagel ½ of one = 4 points and its wholemeal and half is as filling as a whole ww one
WW Oat and Wheat Crackers- fall apart when you try and eat them, pointless really when 4 are the same pp as tuc biscuits which are yum
Sainsburys be good to yourself chicken korma with rice- strange elasticy textured chicken oddness, I'm not sure what they had done to it
Meringue with yogurt and fruit- an idea from the ww magazine. I thought I had a sweet tooth till I tried this. Its like eating sugar from the bag, much too sweet for me.
Most useful discovery:
Sainsburys Be Good to Yourself and Morrisons NUME ranges put the weight watchers points value on all these products, so if I'm out and need a sandwich or quick ready meal etc I can grab one of these without having to work out the points.
Hope that was useful to someone and not just a waste of space 
I would be really interested to see other people's best buys and avoids!