This is how I track all my submissions or places where I have posted comments to:
-> Visit profile (your very own profile - fortunately for my - my profile is easily accessible from the bottom of the front page as top users and top thanked

) - but many can find bookmarks a decent tool to access their profile (once you are in your profile - simply click bookmark from your browser [IE users will have to use favorites

]) , even simpler is with the new site
SEO- you can easily access by
http://forums.pligg.com/members/<your_username>.html
-> My started threads are accessible from - "Find all threads started by
<your_username>"
-> My posts are trackable from - "Find all posts by
<your_username>"
EDIT: The section below is wrongly mentioned and is of different function - enabled you to see the posts where you received thanks from others.
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-> How do I track my important posts?
I have an habit of
thanking people for valuable information/solving my problems - so all these links gets listed under "Find all thanked posts by
<your_username>"
Hopefully these Tips work as a hack for your posts management at Pligg forum

- to remember start clicking
"Thanks"