XJournal has three ways it can let you know your friends page has updated:
1. It throws up a Dialog Box that must be clicked through to keep doing what you were doing, giving you the option to immediately open your web page.
2. It starts frenetically bouncing its icon until you click on it.
3. It plays a sound you designate.
It will do any combination of these three things you want.
1 is tremendously annoying and I hate it like I hate tyranny.
2 is what drove me away from Journalert. If I'm not ready to read my friends page, I don't need my damn journalling program pretending it's so important it has to constantly draw attention from me.
3 is neither easily checked when I get back from leaving the computer (yes, I leave my computer sometimes) nor particularly welcome. I have differing sounds for alerts, for two different e-mail programs and for IMs. Another sound I have to interpret better be polyphonic and entertaining.
iJournal doesn't do some of the cool things Xjournal does, like autoblockquoting and offline creation and storage of posts. But, it's the current industry best Friends page alerter. It changes the icon on the taskbar, it puts an unobtrusive notice up on its composition window, and it places an icon in the menu bar. Any one of these instantly tells you you've got friends' LJ posts to read, and can stay there until you get around to them.
I like that. I like that a lot.
So, executive decision. When sitting online, I'll use iJournal. When offline, I'll use Xjournal to create and store posts for later posting. Everyone happy? Cool.