SELECT ALL FROM /home/hashbox/todo.org WHERE heading CONTAINS todo
Oh and I found this image I made a while ago, kinda neat I think :)

Add OrgQL to that, and that's pretty much my todo list flow :)
Edit: Oh and while we're at it, here's a one liner bash function for opening links in a file:
function nav() { grep -ohE "[[:alpha:]]*://[[:alnum:][:punct:]]*" $@ | while read; do xdg-open "$REPLY"; done; }
# use like this
nav todo.org someotherfile.txt
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# use like this
nav todo.org someotherfile.txt