The Panbo blog pointed me to this nifty web mashup between NOAA charts and Google satellite maps.

You can use the sliders at the top right to change the opacity of the different displays, so that you can have one "show through" the other. Really slick.

HotMaps Explorer, powered by Fugawi, is a commercial offering charts to explore 10,000+ freshwater lakes all on one DVD. It's not designed for navigation or detailed work, but for exploring options and planning purposes, it looks interesting. For $20 might be handy.

Maptech is offering a new web page to find and download free charts. There are other sources for these online also, but this may be useful to you, and the price is right :-)