I really should take the method of Frank Nora to heart for these weeks when I've really got little time to Ramble or little to Ramble about (or both, as is the case this week). What Frank does for his podcast (The Overnightscape) is to occasionally record a spare when he's really going good, so that he has something to drop in place when time is short or the muse is fickle.
Sadly, I haven't done that. So I instead recommend that you go pay Frank a visit - you can find him in the podcast directory on iTunes or streaming at his own site, so do so. I have listened in a little while, but I'm sure the current election and economic crisis has given Frank a lot of grist for his mill.