Mac OS X 10.5.2 AirPort/D-Link DIR-625 802.11n workaround: drop to b/g
Most of these same posters have reported that disabling 802.11n mode and using the router in 802.11b/g only mode restores connectivity.
This may be an incompatibility between D-Link's implementation of the 802.11n draft standard and Apple's implementation of a later version of the draft standard.
This post exists to document the workaround and as a suggestion to others having difficulties with other vendors' 802.11n routers to try the same workaround.
If you have success doing the same with another vendor's router, please reply below.
In the mean time, if you are an affected D-Link customer, you may want to contact D-Link customer service to inquire about the issue while Apple engineers investigate.
Quad 2.5 GHz G5, 5 GB | 2.33 GHz MBP C2D 2 GB, Mac OS X (10.5.2)