Sorry to shatter another urban myth, but Vegemite is made from the by-product of beer brewing. THAT'S why it's good for you!!
I had to remove a huge Huntsman from the bedroom last night when I got home. I trapped it under a glass bowl and then slide a large piece of card under. Held that down hard to keep the rotten thing in, then released it in the flower bed. They are good guys although they look scary.
So far this summer I have killed about a dozen Red-Backs. They are endemic to northern Victoria, along with just about every other spider in creation.
The other one I don't mind is the Orb Weaver. They build huge "Charlotte's Web" type classic spider-webs across the pergola, which look beautiful with the dew on them in the morning. Just don't walk into their web as it is like wire rope!