I would like to double what Andreas said. There’s nothing wrong with posting once in a while. I post once a month these days and it’s perfectly normal.

On the other hand I am wondering if you ever asked yourself why you’re blogging (or used to blog). Why you are blogging?

First of all there is the entire concept of RSS feeds. As you yourself don’t have to check blogs manually for updates, there is a very low “cost” in letting your RSS reader keep tabs on a mostly inactive blog.

Secondly there is the fact that once you post something on your blog, it is picked up by google, as well as other search engine, and hence made available for anyone who might potentially have use for it. In that regards a low number of posts most likely contains more value than no posts at all.

Myself I am not much of a blogger, but I do like to keep my blog around for those few times I’ve discovered or produced something potentially useful. Based on visitor statistics, referrers and what I have been told, there has actually been a bunch of posts which has turned out useful for other people.

In the same fashion, I really appreciate when someone else have had to figure out an unusual as well as kind of undocumented problem, and written a blog posts about it. There have been a few times when finding that sole blog post really, really made my life/job easier.

…and to finally answer your question. Whenever you have solved a general as well as non trivial problem, and where google couldn’t give you a quick answer, please document it in your blog.