One thing that really, really helped us was our angel investors asking for a monthly update. They were very hands off, but just wanted to be kept in the loop about what was going on.
Aside from it taking a while to get out of the habit of 'putting off sending the email until the next big piece of company news was out' (which is never a good idea), it was amazing to see the different reactions to sending them a very personal, informal email with updates not only about the company but about the team as well, rather than just a fact / numbers based 'company update'.
I'm sure this is obvious to anyone on the outside, but it's so easy to miss the internal stuff when you're growing (both traction and team). I highly recommend that anyone starting a business finds someone they trust (investor or not) with whom they can send such a monthly update. Not only will it help put things in perspective, it's good practice for when it's necessary to write ones to the team like this one from Keen.