The list of possible Bobscure puzzle methods is endless. Heer is short list of some of the usual suspects.
Google stuff!
Coords of BFE caches
List numbers from a random list
Binary
Octal
Hex
Base36
Number of Bob's finds
Words in numbers
Letter values
Binary
Base36
Scrabble
RGB
ASCII
ROT13
Phone pad
Postcodes
Roman numbers
X-lotto
Wingdings2
Bus stops
Binary
Base36
Webdings
US States
ASX codes
ISD codes
Hex to text
Braille
Morse
B10-B16-hex-text
British Grid
Obscure electrical tables
Geohash-36
Daynumbers of the year
Hidden image in archived cache
Text to hex/bin to B10
Keyboard symbols to numbers
First letter of words
Seven segment displays
History sites
JaVaWa site
And so many more...
Then there is the phrase we have all learnt to fear.
Use the information supplied in a multi-step, obscure way, to find the numbers represented by
ABCDEFGHIJKLMNO
"This geocache has been approved by BFE".
"This geocache has been approved by Victims of BFE support group".