Me too. I have been running Windows 7 RC and as of yesterday Windows 7 HP official version.
I have been letting Windows 7 do its thing without any of the tweaks I used for XP. In the last few months, I have not had any reason to want to tweak. Everything just works and works well to my perception.
All in all, Windows 7 way outshines XP for me. Still, I suppose someone who is running benchmarks may measure a difference in XPs favor from time to time.
The biggest speed burst I have both "seen" and "felt" in a long time came when I went from dual-core to quad-core. Even at the same GHz, the quad really made Vista desktop activities and program loads "pop". Windows 7 is about the same but a bit faster than Vista so far.
Of course, tweaking and overclocking and etcetera are fun and interesting in their own right. So, its not that one shouldn't do those things. Rather, I'm providing the perspective that it may be less needed than before.
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ATI Crossfire Sapphire 2x HD5870 - Eyefinity 5760x1200 24", 1xDell-U2410 H-IPS + 2xHP-ZR24w S-IPS, Phenom II X6 1100T@4.0GHz w/Swiftech Water Cooling, 16GB GSKILL PC3 1866@1333, ASUS Sabertooth 990FX, WDigital + 3x Seagate + Hitachi + 2x WD Ext = 10.0TB, Sony DVD, OCZ ZX 850W PSU, CoolerMaster HAF922, TM Warthog HOTAS, TM T-Flight Stick X, TM Cougar+FSSB & CH Pedals, Saitek X52 Pro & Pro Combat Pedals, TrackIR5 w/TC Pro, Windows 7 HP 64b