So, versions 2.1.2 through 2.1.6 went by without any official announcement, so it seems like it’s probably a good idea to note that 2.1.7 will be the last release of YAK for the v2 series of WordPress (other than a bug fix release or two, perhaps).

Changes (in this latest release) since 2.1.1 include:

2.1.2

• Fix bug with sales tax via manual CC entry, along with removal of spurious <td>
• Fix bug with sales tax via accounts receivable entry

2.1.3

• Fix sales tax in PayPal Std checkouts

2.1.4

• Fix processing problem with failed Authorize.net payments
• Fix rounding issue with sales tax values sent to PayPal

2.1.5

• Fix bug with confirmation email (missing sales tax, totals wrong)

2.1.6

• Add back missing code to handle unlimited quantities

2.1.7

• Fix problem with incorrectly calculated shipping after validation error
• Increase timeout on Authorize.net connections (occasionally seems to cause a problem)
• Fix problem with unlimited quantity handling
• Add shipping type to email flags
• Add check for the address_entry function existing (seems to cause an incompatibility with another plugin)

The next release (which may not include any major changes at all), will be 2.2.0, which will be the first official version tested against WP3.