I am getting into preserving this chrissy and this is what I am doing
putting the jam jars and lids in a water canner to sterilise - I am using a big stock pot with a pasta boiler - could use a cake rack - need to have perferations as jars have to be off the bottom. Bring to the boli and boli for 5-10 mins. I do this wile I am makign the jam. Get them out with tongs and put them on a clean tea towl to dry.
I make the jam etc (I don't overcook it - I bring it to a rolling boil at Varoma temp for 1 min then let cool for 5-8 while stitting Reverse soft so that the fruit will settle nicely) then I pop the jam in the jars, put the lids on tight and put them in the water bath with water covering by 3 cm. I bring to the boil and boil for 15-20 mins then bring them out and leave them to dry on a tea towl (not anythign cold or they will crack) then store them.
This seems to be what we are meant to do nowdays from the research I have done. This way for eg I can make lemon curd and it shoudl keep for 3-4 months without opening - once opened it needs to go in the fridge.
These links are good:
water canning method
http://nchfp.uga.edu/publications/uga/using_bw_canners.htmllemon curd
http://nchfp.uga.edu/publications/nchfp/factsheets/lemon_curd.pdf