This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Using JNDI will only work for Java clients, as you point out. But is also uses some non-standard ports which you may not want to open up to the world. Web Services require only port 80 (and/or 443), which are usually open already.