Hi, are you looking for an application which can convert to HTML (or online web pages) to PDF or PS ? Yes, you have that! Its available under GNU General Public License (GNU GPL) and also under commercial license. Though the version available under GNU GPL has some limitations... but its enough for an home user...

The software's name is HTMLDOC. You can download its GNU GPL version at www.htmldoc.org

Its highly efficient. I converted a single html file of PHP manual to PDF of 11 MB with "Best" mode compression in less than 5 minutes. The PDF version contains 4261 pages!!! Imagine! That too on a P3 500 Mhz with 384 MB RAM.. If you have a better CPU then it might do it even much more faster! ;

Here's a sample screenshot -

In Linux, File-Extensions make no sense. Linux isn't like windows which judges file-types by its extension. Rather, Linux looks into the file for its content and shows you its type. The File Extensions used in Linux is just to help humans judging the file-type of the file and of-course some programs which have been designed as.

To determine a file's type in Linux, on the command line is very easy.

$ file filename

Consider this -

[nilesh@localhost ~]$ file image.png 
image.png: PNG image data, 282 x 76, 8-bit/color RGBA, non-interlaced
[nilesh@localhost ~]$ mv image.png image.jpg
[nilesh@localhost ~]$ file image.jpg
image.jpg: PNG image data, 282 x 76, 8-bit/color RGBA, non-interlaced
[nilesh@localhost ~]$ mv image.jpg image
[nilesh@localhost ~]$ file image 
image: PNG image data, 282 x 76, 8-bit/color RGBA, non-interlaced

The above *REAL* example makes it clear that file-extensions in Linux make no sense internally.

Guys..
Just Brushing up.........
Here, is the list of 123 extensions....

*****Common Extensions in MOST OSes*****

386 - device driver for Windows 3.1
.acd - allClear v4 diagram file
.acl - allClear v3 script or format file