Omniweb stores bookmarks in a standard HTML file, which can be read by any browser on any OS. In Omniweb, choose Omniweb::Preferences::Bookmark on the menu and change the location of your bookmarksfile to file:///~/sites/bookmarks.html
Provided of course that you have switched on the Apache webserver, your bookmarks can now be accessed at http://yourmachine/~yourname/bookmarks.html. If you haven't yet built any HTML pages, you might even name the file index.html and it becomes the default file, so http://yourmachine/~yourname brings it up. You can still edit the file by simply maintaining your bookmarks in Omniweb, no HTML required.
I use this trick to access my bookmarks from Opera on NT4.
P.S. would love to login here, but can't, probably because I have switched off cookies. Oh well .Cubist
[Editor's note - yes, cookies are required for a login ID. Sorry!]