here's a script to help with it...

It works like this... while in the editor u launch this script, it shows a menu with existing bookmarks and an 'add bookmark' option... just click the menu according to need.
bookmarks are made so that they work even if the file contents are changed... they don't remember line number ... rather they remember what's on the bookmarked line! ... this'll help u get back to THAT particular location in your code even after u changed something above it!
when adding a bookmark, the format is:
complete line in file that u want to bookmark**text that'll be shown on menu
( the 2 asterisks delimit the file text & bookmark name )
and if u want to delete a bookmark... press shift while clicking on the menu!
i've made it keeping PSPad in mind but i've made it re-configurable and commented it so that users using other editors can easily adapt it.
Script