Envelope challenge

I'm trying to save money in envelopes for various trips and things. Every time I get $1.00 bills, I load up the envelopes.

These are my envelopes:

Disney World-Oct 2003-all my washer woman tips go here too
Kayak trips-$10.00 per transport-Would like to save for 3 trips-$30.00
Dover Nascar Race-Sept 2003-to try to take DH for his birthday. We are within driving distance, so it's the tickets I need to save for.
Camping-a week at the shore in August with the kiddies. About $100.00 needed to pay for 3 nights (MIL pays for the rest)
Christmas 2003-nuff said!
Wildwood-June 2003-weekend at the shore with DH and kids-our annual trip

So far I've been good and haven't touched anything. Does this work for you? What are you saving for?