I've read through the thread and I didn't see anything explicit regarding this subject, so let me pose the question here:

For those of you who are doing quarterly payments, which ("good") offers are still open? From what I can tell:
- MP Visa is still doing double bonus through 12/31/06 on federal/state/local
- SPG and Delta AmEx are no longer doing any bonus

For what it's worth, I did my June payment on the Juniper US MC. I figured that 1.5x bonus was better than nothing, and that (with an extra 1.5 month's worth of interest in HSBC online savings) gets me down to around 1.4 CPM. However, I'm considering getting the MP Visa for the double bonus (taxes add up quick!)