Some extra worries for whoever needs them:
Djokovic is starting to become a serious threat again to Federer's top 2 ranking streak after Wimbledon. This streak started November 17, 2003 and may be one of his most impressive records. It is guaranteed to extend to 346 weeks (mid-Wimbledon). In the 2008 year end rankings Djokovic was only 10
points behind Federer!
As for now, Djokovic will have 6165 points after Wimbledon, plus anything he gains in RG (by winning QF or even more) Queens(does he play?) and Wimbledon. Federer will have 6390 after Wimbledon, plus anything he gains at Halle and Wimbledon. This means that, if Djokovic loses in the RG semis to Nadal (the most likely scenario), Federer must outperform Djokovic on grass to stay ahead of Djokovic.
This should be no problem though, normally.