In our first Lifehacker Wishlist, we came up with five wanted features in Google Voice, including an easy way to record and transcribe notes for yourself. Mark Stout suggests a Voice settings tweak to fulfill that wish.
Stout's method involves setting up a special group in Voice's caller settings for yourself (dubbed "Special Transcription" in his case), adding your cell phone number as the only member, setting up a very short greeting for that group, then setting the "Direct access to voicemail" question to No. He calls his own Voice number, records a memo, and it's transcribed and sent to him via email. If you rely on listening to your voicemail over your phone, this makes pressing the "#" key during your uber-short greeting somewhat tricky. Then again, if you're cool with Voice's mostly-okay transcription, you likely don't listen to your voicemail all that often.
Hit the link for Mark's full run-through, and leave your own methods for recording an audio note to self, with Google Voice or without, in the comments.
Recording your own notes with Google Voice [Ideas from Mark Stout]