Format of OIDs:

They now have their own format:

Local OID (32 bytes):  ppttttttttrrqq:uuuuuuuuuu:xxyyzzvk
Global OID (40 bytes): ssssssss:ppttttttttrrqq:uuuuuuuuuu:xxyyzzvk

Trailing 0's may be ommitted.

tttttttt   - Unix time_t of its generation.  This represents 32 bits of time_t.
rr         - fraction of time_t in 256ths of a second
pp         - 8 additional bits of unix time_t, bits 32-39
qq         - sequence number, 00-ff.  Incremented every time an OID is generated and wraps around. Not reset every second.
v          - version, currently 1, will be incremented if this spec changes after production
xx         - object primary type (see primary types below)
yy         - object secondary type
zz         - objects data type
ssssssss   - site number (32 bits)
uuuuuuuuuu - owner's UID (40 bits)
k          - ID check, found by xoring all nybbles a nybble at a time.  The

Handling of type and subtypes:
A new type should be assigned for each handler that will process a new type of data.
Default or unknown data should have the subtype 0000.
When a handler will handle multiple types of data, 

Site numbers: 
00ssssss - Reserved for your use.
01ssssss - fffess - Allocated globally
ffssssss - reserved for our use

User IDs:
00uuuuuuuu: Reserved for your local site.  These users will not be able to be seen by the global system
ffuuuuuuuu: Reserved for our use.
01uuuuuuuu - feuuuuuuuu: Allocated globally

Primary types (some secondaries specified for examples):
00     - reserved for NULL_OID - ANY OID with this byte set to 00 is considered to be null even if other data is present
01     - Page (generic)
0101   - Page (main or site front)
0102   - Page (user profile)
0108   - Page (wiki style)
0109   - Page (generic user created)
10     - Standard module (use the internal python handler)
1001   - Python module (use external python handler)
1008   - Java application

100c   - PHP module
100d   - Ruby/Rails module
100e   - CGI (execute via shell)
20     - Image (any type)
20xx01 - jpeg
20xx02 - png
2001   - Image (thumbnail)
2002   - Image (external include)
200201 - Furaffinity
220202 - Inkbunny
220221 - e621
30     - Sound (default)
30xx01 - MP3
30xx02 - WAV
30xx03 - MOD
3001   - Sound (background)
3002   - Sound (player)
38     - Sound (stream)
40     - Document (any)
40xx01 - docx
40xx02 - rtf
40xx03 - odf
40xxyy - etc
4001   - Document (as story/fic)
4002   - Document (preformatted text)
4008   - Document (Text only) 
50     - Video (any)
5001   - Video (embedded player)
5002   - Video (youtube)
5008   - Video (stream)
5009   - Video (Any Flash type)
60     - Chat (any)
6001   - Chat (IRC)
6002   - Chat (JSON / FChat style)
6003   - Chat (Jabber - Internal)
6004   - Chat (Jabber - External)
61     - Virtual World
6101   - Virtual World (text based / MUCK style)
6102   - Virtual World (Second Life / OpenSim)
6103   - Virtual World (High Fidelity)
6104   - Virtual World (IMVU)
70     - RAW (try to determine type, variant type)
7001   - Binary data (don't display)
7f     - RAW (insert content at point)
80     - User account
88     - User profile 
90     - Group
98     - Group profile
a0     - ACL/Lock (Object is a proptree of allow/deny for other OIDs)
b0     - Property trees (added as referenced to current page)
c0     - External site include
c01b01 - Inkbunny journal entry
c0e401 - Twitter tweet
c0fa01 - Furaffinity journal entry
c0fb01 - Facebook post
c0xxyy - expand as needed
d0     - 
e0     -
f0     -