I have started to notice on my feed statistics a change in user behaviour segmented by reader. Feedburner users tend to be there every day, whereas MyYahoo! and Netvibes-sourced traffic drops off dramatically at weekends. I suspect that the reasion for this is to do with the format that the data is presented in by these services and how directly this is related to user audiences. Feedburner uses an Outlook or Mail.app-type layout which isn’t pretty but does lend itself towards productivity.If you have a whole pile of feeds to read, sense and you consume information the way builders consume the sports pages this approach makes the most sense.
If however your information consumption is lower, it makes sense that you would have a few feeds on a metaportal like netvibes and are likely to have other things to do on your weekend.