EDIT:
Good friend and cousin
moki had so kindly pointed out the inconsistencies of the first link I posted. (Thanks, dear! ^_~*) In searching for better resources, I cam across these two:
GrammarMonster.com offers an easy tip on determining whether it's the C or the S that cuts it. It also features other tips for the word pairs Effect & Affect, as well as Licence & License.
For a much more geographical (and nitty-gritty) approach, see
Brandle.com.au. It features the uses of the two some that are Ok or otherwise in Brtain, Austalia and the USA.
As for the difference between Advice & Advise,
Dictionary.com offers some help on this. :)