I kept getting "missing semicolon in dictionary" from every program I open

[hh83917]

I am using Leopard and after downloading few sample jpeg images from a website, Dock, Stack crashed and keep on crashing as the dock below continues to open and close. Everything else seems to be functional so I checked the Console. Here's what I get:

11/2/07 1:55:51 PM Dock[487] *** -[NSCFDictionary addObject:]: unrecognized selector sent to instance 0x2a2c00
11/2/07 1:55:51 PM Dock[487] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFDictionary addObject:]: unrecognized selector sent to instance 0x2a2c00'
11/2/07 1:55:51 PM Dock[487] Stack: (
2502954816,
2519762604,
2502983944,
2502977284,
2502977944,
2502097828,
2480860716,
2500633352,
2500455396,
2500458440,
2500454396,
2500458440,
2500454396,
2500458440,
2500454396,
2500458440,
2500454396,
2500458440,
2500454396,
2500443128,
2500434268,
2480854904,
2480995600,
2480985864,
2480799412,
2480819316,
2480819112,
2455051148,
2455052628,
2455070976,
2455065704,
2455068496,
2455040172,
2455040908,
2455041128,
707660,
2416811480,
2477980668
)


And this thing continues on non stop. It seems like stack it trying to show the thumbnail of those images in the Downloads stack in the Dock but was unable to and crashed.
So I went to Downloads and moved those images somewhere else and the Dock stopped quitting and restarting on me. I checked permissions and restarted my Mac and now everything I open says:

11/2/07 7:07:06 PM Activity Monitor[368] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
11/2/07 7:07:15 PM Finder[264] *** _NSAutoreleaseNoPool(): Object 0x1592a180 of class NSCFNumber autoreleased with no pool in place - just leaking
Stack: (0x901a6184 0x900d4130 0x952f5d78 0x952f5afc 0x30a544 0x30a688 0x9d90 0x93b2fbfc)
11/2/07 7:11:49 PM DashboardClient[113] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
11/2/07 7:12:25 PM Spotlight[85] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
11/2/07 7:12:33 PM Safari[118] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
11/2/07 7:24:19 PM Calculator[131] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.


What the hell is "CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary"? and what is "_NSAutoreleaseNoPool(): Object 0x1592a180 of class NSCFNumber autoreleased with no pool in place - just leaking"? I kept on getting that from the Finder.

This is the 3rd day of using Leopard and it's already driving me nuts...