Does he already homebrew? If so equipment might be difficult - many homebrewers have a pretty tight ship running so to speak. If he does, I will tack on to other people's ideas of personalized glasses. Another really cool gift if he kegs is personalized tap handles. You can find a bunch at etsy where people will customize really nice wooden tap handles.
If he doesn't already homebrew and you're looking to buy some starter equipment I would recommend:
*Basic kit (Usually comes with a fermentation bucket and bottling bucket - make sure this includes an autosiphon)
*Extra bucket with lid (use this for storing star san)
*4 oz bottle of star san (this will last a long time if you use DI/RO water to make 5 gallon batches that you store in the bucket)
*5 gallon kettle
*Extract recipe for favorite style of beer
*Bottling caps
*Large plastic bin to use for a swamp cooler
That's enough equipment to produce some really good beers without breaking the bank.
