This tip comes from First magazine November 2005 issue:
Double the life of rubber spatulas
"Forget spending money on a set of new rubber cooking spatulas when your current ones are frayed, singed and not scraping as well as they used to. Instead, snip 1/4" off the tip with a pair of sharp scissors, cutting a smooth line from one corner to the other. The fresh, sharp edge works like new, ensuring your favorite scraping tools are more effective and last twice as long."