Love Coda 2 and am very excited about Coda 2.5. The one major annoyance for me with 2 was not being able to search remote locations. I don't see this in the release notes. If the Panic team is listening, can we get this in version 3?
I would like this feature too (as well as indexing symbols from remote files), butI wouldn't expect it, due to the potential for overwhelming a server by downloading hundreds or thousands of files. Doing the search server-side would be prohibitively complicated, due to the variety of shells and environments. The workaround would be to use a setup that mounts SFTP drives locally (ExpanDrive, MacFusion, etc).
It doesn't seem totally unsolvable, though. I mean, if Coda can connect via SFTP then it can almost certainly connect to the server and run commands like awk, grep, find, Silver Searcher, etc. There's no technical reason why Coda couldn't run those commands on the remote host and return their results to you.
That's still quite a frigging challenge, obviously - there's a huge range of Unix utils that may or may not be available on each individual remote host. Coda would have to do some trial-and-error and/or probing on each remote host to see what's available.