Put DD-WRT in wireless router?
Some older routers have 4MB of flash adn can be upgraded to DD-WRT featrues set.
But some older models, even Netgear and Linksys, don't have enough free flash to hold the small Linux kernel.

Wha can DD-WRT do for you?
A. Turn a wireless router in a repeater.
B. Run small Linux utilities.
C. Increase power.

This lifehacker article shows how you can have a super charged router for almost free.
Hack Attack: Turn your $60 router into a $600 router

Before you buy and old wireless router, check this list. Some of this can be had for under $16 on eBay.
Supported Devices DD-WRT

EDIT:
Video:
http://www.youtube.com/watch?hl=en-GB&v=TzvkWQYavok
How to Install DD-WRT on a Wireless Router - Techneek TV

But I have not done this. Not YET.
So my question is: Has anybody here done this and did it work well?Yes. I have with a TP-Link WR841ND-running stable for over a month now.


I have increased my antenna gain from stock 20 dBM to 40 dBM-now I can access the Net even while I'm in the loo!


I have used it as a PPTP server so I can access my files remotely, and have also setup a Hotspot login page to see how a captive portal works.


I noticed a distinct performance increase with DD-WRT on my 4 MBIT connection-my ORIGINAL max 200 kbps DL speed increased to 330 kbps max!I know somebody who is ecstatic about DD-WRT. can't remember the model of his router, but it was a DIR-*something* wireless-N router. Not DIR-655, though, that's mine and it doesn't work with DD-WRT.The most common DD-WRT compatible D-Link router over here is the DIR-615...Quote from: BC_Programmer on September 08, 2011, 10:14:54 PM

I know somebody who is ecstatic about DD-WRT. can't remember the model of his router, but it was a DIR-*something* wireless-N router. Not DIR-655, though, that's mine and it doesn't work with DD-WRT.