While eagerly awaiting KDevelop4 to become stable (it crashes on me too often right now)...
I'm back to forgetting vim commands 
To get a list of files on the left (still need to get comfy with it, but it looks useful) use the Project plugin
Substitute (replace stuff - I've used this so often that I remember, but maybe you don't yet?)
:%s/what/with/g
(with % on the entire file, without only current line)
(g all occurrences in the line, without only the first hit)
Do something on lines that mach a search pattern (this is what I always forget because I don't use it that often):
:g/search pattern/command
Delete empty lines using the above:
:g/^$/d
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