Older Guinea Pigs: Considerations
Older guineas can get overlooked by potential owners. This article gives an idea of some considerations based on character and anecdotes.

Toys for Guinea Pigs
An extensive list of fun toys to place in your guinea pig's cage so that he's never bored!

Keeping Outdoor Guinea Pigs Safer from Foxes (UK relevance)
"Knowing your enemy" can result in increased chances of your outdoor guinea pigs staying out of harms way - advice on staying safer from foxes.

Contents of a Guinea Pig Medicine Cabinet
This article lists the recommended contents of a Guinea Pig medicine cabinet. One can never be too careful.

Increase Your Chances Of Keeping A Bonded Pair Of Boars (Male Guinea Pigs)
Increase your chances of keeping two male Guinea Pigs together by recognising that what you do is more likely to affect the chance of success, than anything within the pigs’ own character or control.