E1505 Dual Core
Intel® Core DUO T2350 (1.86GHz, 2MB L2 Cache, 533MHz FSB), Genuine Windows Vista Home Premium
MacBook Pro, 15-inch, 2.2GHz
Part Number: Z0EB
2.2GHz Intel Core 2 Duo
Apples and oranges, and I don't mean on the PC/Mac side - the Dell Inspiron series is a consumer-line machine, and not directly comparable to the MacBook Pros in durability, weight or price.
If you compare a professional line PC (Latitude D820 or D830, via Dell small business [or other non-home/home-office lines]) to the MacBook Pro, or a regular MacBook (although screen sizes won't be equal) to an Inspiron you will have a much closer comparison.
The last time I checked, the MacBook (non-pros) had a negligible-to-small price premium over Dell (which tends to be among the cheaper PC manufacturers, at least once promotions are factored in) while the MacBook Pros had a pretty significant price premium over Dell or even Lenovo's Thinkpad line.
They're also not really all that comparable in other ways - other folks have noted the 1.86ghz vs. 2.2ghz clock speed difference, which is not insignificant, but the fact that the processors are two generations apart is actually more significant (cache size and front-side-bus speed matter a lot.)
Lastly, adding the cost for readily purchaseable 3rd-party accessories like a mouse or printer to either system is disingenous in my opinion.
For a better comparison, and using your numbers for the Mac:
System - $2078, Applecare - $349, total 2427
Dell Latitude D830 through Small Business, spec'd out as closely as the limited information on the MacBook Pro allowed:
System $1531 (or $1839 pre-discount), CompleteCare damage insurance 3yr $169 (warranty already 3 years) = total $1700
Add $180 to extend warranty and CompleteCare to 4 years if the AppleCare above is for 4 years.
Moving to XP Pro or Vista Business adds about $100 through Dell, and is generally cheaper to do via a student-discount copy of XP/Vista.
PROCESSOR Intel® Core 2 Duo T7500 (2.20GHz) 4M L2 Cache, 800Mhz Dual Core edit
OPERATING SYSTEM Genuine Windows® XP Home Edition, SP2, with media edit
LCD PANEL 15.4 inch Wide Screen WSXGA+ LCD Panel edit
MEMORY 2.0GB, DDR2-667 SDRAM, 2 DIMMS edit
HARD DRIVE 120GB Hard Drive, 9.5MM, 5400RPM edit
OPTICAL DRIVE 8X DVD+/-RW w/Roxio and Cyberlink Power DVD edit
VIDEO CARD 128MB NVIDIA® Quadro NVS 135M edit
WI-FI WIRELESS CARD Intel® 3945 802.11a/g Dual-Band Mini Card edit
BLUETOOTH WIRELESS Dell Wireless® 360 Bluetooth Module for Windows XP edit
FINGERPRINT READER OPTION Standard Touchpad edit
BATTERY 6 Cell Primary Battery edit
PRIMARY POWER OPTIONS 90W A/C Adapter edit
FLOPPY DRIVE No Floppy Drive edit
WARRANTY & SERVICE 3 Year Limited Warranty plus 3 Year Mail-in Service edit
ACCIDENTAL DAMAGE SERVICE Add CompleteCare Accidental Damage Service to 3Yr Lim Warranty edit