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I don't know about /grit/. I seem to remember that being a board on this site already.
Seconding /webm/ and the alcohol board. We have a .gif board, so why not have one for .webm files? And with alcohol, we could call it something like /aa/ or /proof/.
Also suggesting boards for the following:
/cough/- Tobacco and tobacco accessories. Discussion could range from local law, to our favorite brands, to our preferred smoking methods, and so on. This could be combined with the alcohol board as /at/ (alcohol and tobacco).
/50/ or /old/- Over 50. Discussion includes antiques, collectibles, the elderly, houses, ancient artifacts, etc. This board is for the discussion of everything which is over 50 years old. Alternatively, we can have a plain history board called /hist/.
/mech/- Machines. For the discussion of machinery both hypothetical and real. Cars, mechs, prosthetics, circuitry, automata, homebrew devices, energy sources, spacecraft, watercraft, etc. This might conflict with the "technology" part of /sci/, though, so I'm iffy as to whether or not splitting the board would do much to improve the site. So, to this, I have another idea:
/hb/- Homebrew. Homemade machinery, devices, and tools. Could be used for the discussion of how to build your own versions of the things I listed above, and could also accommodate the rising trend in 3D printing, providing things like blueprints and how to make your own 3D printer.
/dow/- Economics. The discussion of the world economy, small scale economics, taxes, and local business. It might make a good merger with /pol/ as /ep/- Economics and Politics.