Helma Hosting

VPS hosting is probably the way to go:
Here are some examples:
http://www.slicehost.com/
http://www.silverrack.com/

Otherwise for Java hosting: Jetty is generally preferable to Tomcat. It just seems more clean. The Helma download uses Jetty as its webserver. However, if you don't have the means to host your own webapp and need a host, most Java hosts seem to use Tomcat. In addition, Java hosting tends to be more expensive that other types of hosting. Here is a hosting provider which hosts Jetty in a private JVM for $14.99.mo. I am not affiliated with this company nor have I yet employed them, this just looks like a "find".

http://www.hostjava.net/java_jetty_private.html

Explain how to run Helma w/o using the included Jetty, with an existing Jetty install.
(Possibly create another article for how to host using Tomcat.)