The point Shams made about Holiday Sales being roughly 40% of sales for a year is a very tried and true trend for just about every console, and even applies to a number of other goods outside of the gaming industry as well. In short its an extremely well established trend.
With that in mind I looked back through the '07 weekly average (by month) data and assuming seasonal trends hold up and ignoring potential outside factors we should look something like this for the rest of the year:
| 360 | PS3 | Wii | |
| YTD1 | ~3.7M | ~4.9M | ~9.22M |
| July | 580k | 750k | 1.5M |
| Aug | 620k | 740K | 1.36M |
| Sept | 680k | 1M | 1.75M |
| Oct | 630k | 840k | 1.6M |
| YTD2 | ~6.21M | ~8.23M | ~15.43M |
| Holidays | 4.14M | 5.49M | 10.29M |
| '08 YET | ~10.35M | ~13.72M | ~25.72M |
| LTD | ~26.2M | ~22.59M | ~44.92M |
|
YTD1= Year to Date through June |
Note that E3 definitely imposes seasonal changes to the console data by itself, but there can still be major announcements that effect it further.
Again these are based on current sales rates modified by well-known seasonal trends (which covers seasonal titles like Madden), etc...








