Though a bit dated now (browsers shown are netscape 2.1 and MSIE 2, though versions 3, in beta when this was written, are mentioned) this book is nonetheless an excellent resource for both aspiring and established web developers.
This book is fairly low on the "gee whiz" factors, but that's cool - it's got the info every person trying to make a living out of the web business should know about - how to get clients, how to manage your relationships with your clients, how to do estimates, what kinds of contracts to have, and all sorts of other tips and tricks for running a business.
That doesn't mean that site development is left out - far from it. Ms. Holzschag covers all the bases, showing proper techniques in managing big sites, and has a lot of little tidbits and tricks to share on keeping sites running smoothly, and also how to design entire sites efficiently.
Overall, a great book, and it's probably one of the best purchases I've made all year.