A few days ago I started getting a popup when I restart or wake up the screen on my Raspberry Pi. It says "WARNING: This version is very old! Please upgrade!". My Google searches haven't found a concise answer for the fix for Raspbian Jessie (not sure about Wheezy), so here it is.

The fix for this was posted way down in the Debian bug thread, by hob4bit (message #380)...
In $HOME/.xscreensaver, simply change the setting lock: False to lock: True and save the file.

A more complicated fix would be to download a more recent binary (debian unstable xscreensaver), but I didn't try it and that only delays the nag screen for another 18 months from when that binary was built.

The author made some heated comments on the Debian bug thread as well as writing a his own blog post about it.

Converting version control repositories from Bazaar to Git (bzr to git)

Bazaar is great on Windows. Several years later, git's tools for Windows still.... (ahem) are lacking or too commercial. However, official development on it has ended and git is so much more popular now. So I think the time has come to convert all my beloved bzr repositories to git.

First we need note some prerequisites:

Adding a hardware clock to Raspberry Pi (DS3231)

The popular clock module is uses the DS1307 real time clock chip, which is not very precise. For just a few dollars more, you can get a module with a much more precise DS3231 RTC chip. The one I got was SunFounder's module from Amazon for $9 (free shipping for Prime). It plugs right onto the Raspberry Pi's 40 pin header and doesn't even interfere with the plastic case I have. I have a Model B, but this module should also work on Model A and Model B+. The instructions refer to DS1307, but the chips use the same I2C commands, so it also works for DS3231.

How to run a PiPresents show when you don't have a Raspberry Pi

PiPresents is some pretty cool software that will run a PowerPoint-like presentation. But with lots more flexibility. It was originally written for the Raspberry Pi.

However.... perhaps someone else has your Pi. Perhaps you don't even have one. It is possible to run a PiPresents show on  your good ol' desktop computer (Windows, Linux, or Mac). Here's how.