I use a Linksys Wireless G access point at home. I had been using an iPAQ 4155 pocketpc and the range on that was PHENOMINAL!!
Once I upgraded to the TC1100 I have noticed that the range is somewhat limited. For example I used to be able to walk across the street to my neighbor's house and sit in their back yard and surf from my access point at home on the iPAQ (we're talking at least 900-1000 ft). With the Tablet I can get as far as the curb on the other side of the same street in front of the same neighbors house (about 750-875 ft)and sometimes it will drop off while I am inside my own home. This was BEFORE I installed SP2.
Since I installed SP2, something has happened. I am actually getting better reception, no "drop offs" at all now and I can at least get into my neighbors house with the Wi-Fi on the Tablet.
In regards to the drop offs from inside my own home, I too was begining to think something was amiss with my Tablet. But since I installed SP2 onto the Tablet, all of those issues have disapeared.
Hope this helps!