I have it and it delivers very good performances. The best quality/price ratio for a Core Duo processor with dedicated graphics. If you plan to play games with it, run AERO Glass Interface of Windows Vista, have a future with graphics applications, you must have a dedicated GPU like the ATi Mobility Radeon X1400. I have it and it is nice to play games like NFSU2 and Tiger Woods. The Inspiron 6400 was my first laptop.
If you don't play to have Windows Vista ( it's your choice, but I suggest you to upgrade one time, the beta looks very nice ), if you don't play games, the HP Pavilion dv2000t should be very fine for you of the Inspiron E1405 ( I prefer the look of the HP ). Both have integrated Intel GMA graphics solution, which is fine for battery life and 2D performances. This graphics solution will be able to handle AERO Glass, but it will slow the computer. AERO is in 3D and this GPU doesn't offer good performances in 3D. Even the nVIDIA GeForce Go 6150.
The Core Duo will have a better battery life, a better wireless and better performances than the AMD Turion 64 X2. I don't want to start a processor war, I only say facts ( It's important to precise ).
So the models to look :
HP Pavilion dv5000t with the nVIDIA GeForce Go 7400
Dell Inspiron 6400 / E1505 with the ATi Mobility Radeon X1400 ( delivers better performances than the nVIDIA ).
Dell Inspiron E1405 with Intel GMA 950 ( 224 MB Shared VRAM ).
HP Pavilion dv2000t with Intel GMA 950 ( 224 MB Shared VRAM ).
The problem of all the integrated GPU is that they steal 224 MB of RAM to run. So if you have 512 MB DDR2, your system will have 288 MB free RAM to handle Windows XP ( or Windows Vista ), and other applications / Processes, which is not enought and you lose your money. To profit of the multi-tasking that offer the Core Duo, you must have free RAM to start all the applications. You must "allow" if you want RAM to the processor. If you don't have this RAM, the system will not be able to start all the applications so it will lag, slow the entire system and you wont proffit of the powerful Core Duo. That's why I always recommand to get a dedicated GPU. The X1400 is dynamically shared VRAM. It has 128 MB on-board VRAM ( Video RAM ) and can steal another 128 MB of VRAM when you start an heavy game. That's very nice for an occasional gaming.