Frequency vs. content

Maybe I should expand the topic of my blog. Today is one of those days, where I'm not quite bubbling over with ideas on what to post. It's really not that I've fallen into a blogging lethargy or so. I just had quite a busy day at work and my head is empty. Can't come up with a useful explanation on internet terms at the moment, without doing a bit of research etc. But I do feel some pressure: Ambitious as I am, I feel obliged to post something every two or three day. Why? Because I see that I already have interested people reading my blog! That is sensational, thanks to all of you for visiting my blog! I feel honoured that I'm not the only one reading it.
So, back to my problem, what do you think: Is it better to post a bit more irregular, but only useful information, or do you think it's acceptable to once in a while depart from the topic of the blog (which is for me to provide dummyproof explantions of internet terms), when you can't come up with something good within a reasonable time?
I would use a poll for this one if I knew how it worked... oh well... something more on my to-do-list ;)
Dania