I use iDealshare VideoGo to Convert various video files like MKV, AVI, VOB, WMV, MPG, Tivo, WebM videos etc to Nokia more supported video format on my computer and then transfer to my Nokia. It has both Mac and Windows version.

On Wednesday, November 24, 2010 at 9:38:06 AM UTC+8, blurayripper1 wrote:

Convert TiVo/MKV/VOB/AVI videos to Nokia N900 Video to MP4 for Nokia
N900 Converter
Nokia N900 smartphone, features a 3.5in touch-sensitive screen, 32GB
of on-board storage, a web browser powered by Mozilla technology,
integrated GPS with A-GPS and WLAN IEEE 802.11b/g with UPnP support.
It runs Maemo 5, a Linux-based operating system. It is powered by an
ARM Cortex-A8 600MHz processor and up to 1GB of application memory.
This means users can enjoy faster application processing and
multitasking on a live Dashboard. And Nokia N900, you can make it into
a great with media player for its massive video/audio codecs support including: DivX, XviD, MP4, H.264, H.263, WMV as video codec and MP3,
WMA, WAV, eAAC as audio codec.

So if you get a Nokia N900, you will be so lucky to watch movies with
amazing 800*480 resolution everywhere. In order to help you make full
use of your Nokia N900 movie playing function. Aunsoft Nokia N900
Video Converter is designed to give you more choice to enjoy kinds of
movies. It supports to convert videos to H.264 MP4 for Nokia N900,
including but not limited to TiVo videos, MKV videos, VRO, WMV, TS,
TP, MTS/M2TS videos, VOB videos, AVI, HDTV TP files and RMVB videos.

Have a look at the steps below to convert videos like TiVo/MKV/VOB/AVI/
WMV to Nokia N900, and output movies up to HD 720p resolution or
640*360 pixels aspect ratio.
Step 1. Load videos or HD videos like TiVo/MKV/VOB/AVI/WMV to Aunsoft
Nokia N900 Converter.
Run Aunsoft Video Converter as the perfect video to Nokia N900
Converter, and click the "Add" button to load videos in formats
like .tivo, .tp, .vob, .ts, .mkv, .wmv, .mts, .avi, .rmvb.
Step 2. Choose H.264 MP4 format for Nokia N900.
Click the "Format" option and choose Nokia > Nokia MP4 Series (*.mp4)
as output format for Nokia N900. (When you select Nokia MP4
Series .mp4, you can click Settings to change the video codec to H.
264, video Size to 800*480 pixels, bitrate to 900kbps, framerate to 24
or 30 fbps.)

Step 3. Convert videos to MP4 for Nokia N900.
Click the convert button under the preview window, and the conversion
from TiVo/MKV/AVI/WMV/VOB to H.264 MP4 for Nokia N900 starts
immediately.
After conversion, just transfer/sync your converted MP4 to Nokia N900
for enjoyment.

http://www.aunsoft.com/thanksgiving/

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