The editing tag has no wiki summary.
Dude, where's my cursor?
This user script makes editing especially of large posts easier by matching cursor positions in the text box to positions in the Markdown preview and vice versa.
Stack Exchange Side-By-Side Edit and Preview
The Stack Exchange Side-By-Side Editor adds a link to your edit toolbar to enter side-by-side editing mode. Creates a window with just the edit text area and the markdown preview next to each other.
v0.4,
nhinkle
Suggested Edits Queue for Mere Mortals
Why should the 5000+ rep users have all the fun!
v20120206,
Marvin Pinto