I have been trying to find the specific song too. The techno song playing during the game is Flowers by Terra but I cannot place the song from the seminar. It may have been part of the score.
There are 48 songs in the movie Yes man. In fact it has a really, really good soundtrack. The soundtrack album only has 13 songs, but you can find the videos and downloads for all the songs here:
http://www.reelsoundtrack.com/index.php?act=movie_details&id=52756
Here's the complete list of songs from Yes Man in the order they appeared in the movie:
Ring tone - Separate Ways (Worlds Apart) by Journey
Bigfoot Lodge - Old Enough by The Raconteurs
Dressing for work - To Lick Your Boots by Eels
Outside the bank - Bus Stop Boxer by Eels
Scene from the movie Saw - F*ck This Sh*t by Charlie Clouser
Eyes Down by Eels
The Sound Of Fear by Eels
Your Lucky Day In Hell by Eels
The Spaces Between by Expatriate
Persian Wife Web site - El B'Nia by Maghrebika
Bar song - Swollen Summer by The Bravery
Dancing game - Flowers by Terra
Staring At The Rude Bois by Gallows
Grandma gives service - Emperor Waltz by Lawrence Welk
First song by Zooey Deschanel - Journey To The Center Of The Earth by Von Iva and Zooey Deschanel
Bar song - Hyper Enough by Superchunk
Zooey Deschanel playing keyboard guitar at bar - Star Spangled Banner by Zooey Deschanel
Zooey Deschanel sings at bar - Uh-Huh by Munchausen by Proxy (f/ Zooey Deschanel & Von Iva)
Bar song - In A Jar by Dinosaur Jr
Last Zooey Deschanel song - Sweet Ballad by Munchausen by Proxy (f/ Zooey Deschanel & Von Iva)
6 am running - Helicopter by Bloc Party
Talking at Griffith observatory - Blinking Lights (For You) by Eels
Theme From Blinking Lights by Eels
First Harry Potter song - Prologue from Harry Potter and the Sorcerer’s Stone by John Williams
Second Harry Potter song - Leaving Hogwarts from Harry Potter and the Sorcerer’s Stone by John Williams
Wooden Nickels by Eels
Ana Ng by They Might Be Giants
Animal by Eels
Water Music by Aradia Ensemble
Third Harry Potter song - A Reunion of Friends from Harry Potter and the Chamber of Secrets by John Williams
Hollywood Bowl - Can't Buy Me Love by Jim Carrey and Zooey Deschanel (originally performed by the Beatles)
Talking the man off the ledge - Jumper by Jim Carrey (originally by Third Eye Blind)
Nebraska football game - Mr. Touchdown, U.S.A. by The University of Nebraska-Lincoln Cornhusker Marching Band
Museum - Yes To You by Alice Faye
Umbrellas To Mend by Frisco Jass Band
Lazer Gun by Dr. Dud
Stomp! by The Brothers Johnson
Breakup - The Good Old Days by Eels
Let's Get Small by Trouble Funk
Cool Jerk by The Go by Go's
Bridal shower song - Carry On by Jean Knight
Second bridal shower song - Olde Mill Inn by Blackmore's Night
A Little Bit Of Basie by Red Garland
Flyswatter by Eels
Somebody Loves You by Eels
Riding on the Ducati - Separate Ways (Worlds Apart) by Journey
First closing credits song - Yes Man by Munchausen by Proxy (f/ Zooey Deschanel & Von Iva)
Second closing credits song - Man Up by Eels
Original music for Yes Man by Lyle Workman and Mark Oliver Everett