Oh marco...
I don't believe you have anything to apologise for. Really, honestly, truely, nothing at all. It's lovely that you care enough about this place to be willing to do so when you feel it appropriate, but that doesn't change my opinion that it's just not necessary. You shouldn't need to be pushing yourself to this degree, certainly not given how busy you sound like are with other stuff right now.
I also don't think that your 'silence' could be construed as disappointment. Some people just don't post as often as others, that's the way of things

. Doesn't mean they're not valuable, and you shouldn't be feeling the need to bang your head against a monitor when you find you've nothing to say. You're busy enough doing redesigns, moving boards around, organising the lisacon, etc from what i can see.
Nor is it somehow your fault if everything doesn't run absolutely smoothly all the time. If you were that good at managing people, you'd be better advised to go into consultancy and make a fortune

. People are fickle things and 'activity' is hard to shape and guide - all you can do is try and keep the place friendly and pleasant to view, and let things develope as they will from there. And in that respect i think you do a fine job.
Constructive suggestions perhaps... hmm, maybe you and serge need to get a couple of mods in this place to do more of the day to day stuff? I'm not sneakily voluntering myself here or anything (I'm not really active enough for it to be appropriate by any measure

) but if you could find a couple of people to look after things in general, maybe you'd feel less pressured and be able to find some space to reply to stuff to the degree you want to. That's all I can come up with right now.
In closing, it makes me sad to see you beating yourself up over things that aren't your doing or couldn't be reasonably expected of you. You're great as an admin and another board member (and I've known some awful examples of both in the past) and even through the 'quiet' spells or the arguments or any of the other shitstorms that happen on all forums, i still like lts and find cause to check it most days. And for that I think you should be commended, not distraught.
I can't wait for the day when i'll be able to just sit down, throw away the watch and the calendar, and just plan LTS's future.
I look forward to it too. Now go get some sleep

*packs lisa's bag and sends her on an important mission to italy to give a forum admin an extra big hug*