I just wanted to follow up if anyone else has a question about filters - Robert replied in a comment on his blog: http://www.optimisationbeacon.com/analytics/build-a-conversion-rate-heatmap-by-hour-day-of-week-in-google-docs/
"@Danae, excellent question. Unfortunately, I’ve used the filter fields to extract the hour and day of week data.
If you like to do this you would need to setup 2 advanced segments and copy the 2nd table into another spreadsheet to work out conversion rates. i.e.
1. UK Traffic
2. UK Conversions/Sales/Mobiles/etc
You would apply one advanced segment, copy the second table (“Goals”) in the reporting tab and then apply the other advanced segment and copy the results in the 2nd table in the reporting tab. Once that’s done, you should be able to calculate the conversion rate between the two tables:
UK Conversions / UK Traffic"