I can wort and I can't say enough for it. The convenience of having wort ready to go for starters is worth the effort.
I really plow thru the stuff, though, mostly because I am also producing slants on 5 different house strains. Along with my brew schedule, I have gone thru 9 gallons of wort in five weeks!
As for canning, make sure you hit 250 for 20 minutes in your canner. Also, my very first batch I had a lot of siphoning in the canner as my lids rings were not tight enough.
What else, oh...make sure you have some homebrew on hand, it can be a long day.
Edit: mix in some pints, they are great if you are stepping starters and only need 300-400 ml on the first phase. Also, it seems as if one quart is never enough and two quarts is too much on my larger starters. A lot of my starters are 1200-1300 ml which is a quart and a pint jar, no waste.