Yes, I too participate in forums. It does help in increasing the PR. if u go for the relevent forums it will be very useful.

Instead try to increase you backlinks.

Thats really a cool list. I normally use book marking sites than press releases.

Chk these two. Have just only free directories.

http://info.vilesilencer.com/main.php?rock=seo-friendly-a.php
http://www.web-directories.ws/General/Free/

you have to add a file input

<input type="file" name="upload">

then when it gets uploaded you have to get the temp name and load it into an array or variable tehn send it to the user they want....